Up-grade de PLC-2 AB
Revamping de PLC-2 a SLC500
de Allen Bradley
Cuando se trata de producir un Up-grade a un viejo PLC-2 de Allen Bradley, se supone que la solución directa y sencilla es un simple reemplazo de CPU y en todo caso de chassis, pero esto puede resultar costosísimo.
Surge en su lugar la alternativa de utilizar el sistema SLC500 en lugar del sistema PLC-2, PLC-3 ó PLC-5.
Sin embargo este reemplazo puede no resultar tan directo, razón por la cual se deben tener en cuenta ciertas consideraciones que no se expresan claramente en casi ninguna documentación circulante. Además de que también es necesario comprar algún 1771-ASB en caso de existir más de un rack y entonces el costo se nos vuelve a disparar.
Ofrezco a continuación algunas conversaciones en inglés que circulan en la WEB en algunos foros que nos brindarán una idea bastante aproximada de lo complicado que suele ser este Up-grade, sin embargo es posible.
Particularmente tube mi experiencia al respecto con un PLC-2/30 que contaba con 2 racks locales y uno remoto que reemplacé por un SLC500 5/05 y un 1747-SN/B. Al final de este post explicaré bajo mi punto de vista cuales son los pro y los contra de esta propuesta.
Atte.
Gabriel Pérez Russo
A)
Conversación que nace en la consulta de un programador improvisado y un ingeniero con alguna experiencia previa al respecto.
I received the following in a Private Message from roomi117:
Dear Sir,
I am working on SLC 500. I am looking to connect 3 Thermocouples with the 1771 IFE analog input module. Can you please send me a ladder program example involving more then one analog input.
Best Regards,
Engr. Naeem MaqboolLahore, Pakistan.
Greetings Naeem,
First of all, you should post all of your requests in the forum’s Question and Answer section ... you will get much better results when all members have a chance to respond ... next, we need more information about your project in order to give you any useful advice ...
Issue #1: you said you are working on an SLC-500 ... are you sure about that? ... more likely you are working on an SLC-5/01, or SLC-5/02, or SLC-5/03, or SLC-5/04, or SLC-5/05 ... all of these are sometimes referred to by their “family name” of SLC-500 ... we need to know which processor you are using in order to help you ... it is also possible that you are working with a PLC-5 processor ... (see next issue) ...
Issue #2: the 1771-IFE module that you mentioned will not fit in the same chassis with any of the small SLC-500 processors ... specifically, it is designed for use with the larger PLC-5 system ... it Is possible to use the 1771-IFE module with the smaller SLC-500 processor - but it must be done by installing the 1771-IFE in a “remote I/O” configuration ... specifically, the larger module would be installed in a separate chassis and would communicate with the SLC-500 processor over a “remote I/O” cable ... if that is what you’re trying to set up, then we need to know what “scanner” module (example: 1747-SN) and what “adapter” module you’re using (example: 1771-ASB) ... it would also help to know how your system is configured ... specifically, we need to know what “rack” and “group”, etc. your remote rack is set for ... this is done with DIP switch settings on the 1771-ASB adapter module ...
Issue #3: you said that you want to connect 3 thermocouples to the 1771-IFE module ... the 1771-IFE does not accept thermocouple inputs connected directly to the module ... instead, each of the thermocouples must be connected to a separate “transmitter” ... this transmitter will take the millivolt output of the thermocouple and convert it into a 4 to 20 milliamp signal ... this 4 to 20 milli Amp signal can then be connected to the 1771-IFE module ... (note: there are other ways of doing this, but this is the most common method) ... connecting the signals to the 1771-IFE will require that you have an understanding of wiring “single-ended” and “differential” signals ... are you familiar with those terms? ... and is your 1771-IFE module already configured for one method or the other? ... specifically, is the module already in use for existing signals - to which the 3 thermocouples will be added? ... note that wiring the 1771-IFE module correctly will require that you set the position of a series of small “jumpers” which are located inside the module ...
Issue #4: is it possible that you meant to say that you will be using a 1771-IXE module (rather than a 1771-IFE)? ... if so, the 1771-IXE will accept thermocouple inputs wired directly to the module ...
issue #5: in any event, we’ll need to know what type of thermocouples you’ll be using ... example: type J, type K, etc. ... if you’re using the 4 to 20 milliamp transmitter method, then we’ll also need to know the scaling for your system ... example: 4 milliamps equals 32 degrees Fahrenheit ... 20 milliamps equals 212 degrees Fahrenheit ... etc. ...
issue #6: all of these issues must be covered before we can offer you any specific examples of programming code ... but a basic idea is this: you must “configure” the 1771-IFE module with a BTW (Block Transfer Write) command rung ... this will force the processor to send a block of several words of data to the 1771-IFE module to tell it how it is expected to perform (scaling, number format, etc.) ... then you must program a BTR (Block Transfer Read) command rung which will execute repeatedly ... this will force the processor to retrieve information from the 1771-IFE module and place the information in the processor’s memory table - usually in a series of Integer-type locations ... if all else is done correctly, the readings from all 3 thermocouples will be contained in that one block of information ... example: in words N7:54, N7:55, and N7:56 ... normally the readings are all scaled from 0 to 4095 as raw data ... then we usually program separate math functions to scale the data into readings of degrees Fahrenheit or Celsius ... or it is also possible to “configure” the 1771-IFE module to provide the scaling internally ...
As you can see, the task that you have outlined is not a trivial undertaking ... but if you’ll be good enough to give us all of the details about your system, we’ll be glad to try to help ... personally, I’ll be offline and unavailable most of next week ... so I am posting your request on the forum’s main Question and Answer board in the hopes that some other members will be able to help you ...
I hope that this information will help get you started ... I wish you good luck ...
Best regards,Ron
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July 18th, 2005, 01:44 AM #3 roomi117 Member
Dear Sir,Thank you for your detailed reply. Let me first tell you about my project. I have got 3 digital inputs (2 On/Off P.B for heaters, 1 pressure Switch) and 3 analog inputs (3 thermocouples). The heaters will be turned on after we Push the Push Buttons and the thermocouples will start monitoring the temperature of heaters. At 150 Degree the two solenoid valves will be actuated.This is the main part of the project. Rest are very simple. Previousely I have worked on the PIC Micro Controllers but in Industry the PLC's are prefered more. I don't have much experience working with PLC's but I can do a few things.
Thanks and Regards,
Engr. Naeem Maqbool
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July 18th, 2005, 05:51 AM #4 Ken Moore Member
Join Date: May 2004Local Time is: 12:33 PM Location: Upstate South CarolinaPosts: 1,181 Your thermocouples will not work directly with the 1771-IFE either.
I believe you are a student, it this correct? Are you using existing hardware at your school? Are you planning on purchasing the hardware? If you are using existing hardware, I would recommend that you list the part numbers of the equipment that you have. That way the board can help you decide which parts work together.
Also, there is the software question, do you have the software and cables required to program whatever PLC you are using? So far you've mentioned two different PLC platforms, I would suggest you try and stick with one platform, it is usually easier for beginning programmers."To give real service you must add something that cannot be bought or measured with money; and that is sincerity and integrity."
- Donald A. Adams
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July 18th, 2005, 06:16 AM #5 roomi117 Member
Join Date: Jul 2005Local Time is: 10:33 PM Location: LahorePosts: 11
Dear Sir,I am a student and will always be one. The thing is I don't have much experience working with Allen Bradly PLC's. The problem is mentioned above, can you tell me which processor & I/O modules to use.The other problem is that I haven't worked with the analog I/O. We can use PLC-5 processor & 1771-IXE as mentioned by Ron. I have downloaded a few PDFs regarding the BTW and BTR commands but I am not clear completely as how to use these for more than one anlog input.I look forward for your kind reply.Regards,
Naeem. roomi117 View Public Profile Send a private message to roomi117 Find More Posts by roomi117 Add roomi117 to Your Buddy List
July 18th, 2005, 06:18 AM #6 roomi117 Member
Join Date: Jul 2005Local Time is: 10:33 PM Location: LahorePosts: 11 I have SLC-5/05 model and the RSLogix 500 software. I believe you are talking about the drivers for the communication. roomi117 View Public Profile Send a private message to roomi117 Find More Posts by roomi117 Add roomi117 to Your Buddy List
July 18th, 2005, 07:51 AM #9 JohnW Member
Join Date: Mar 2004Local Time is: 05:33 PM Location: CornwallPosts: 303 If you have not bought the thermocouples yet then use a 1746 NI4 or NI8 analog input module with PT100 sensors and 4-20mA head converters. The NI8 is easier to scale than the NI4. At 150 degC PT100s will give better results than thermocouples. This is a bit more expensive but allows the other analog channels on the NI8 to be used for other purposes. The thermocouple module is the 1746 NT4. JohnW View Public Profile Send a private message to JohnW Find More Posts by JohnW Add JohnW to Your Buddy List
July 18th, 2005, 07:54 AM #10 Ken Moore Member
Join Date: May 2004Local Time is: 12:33 PM Location: Upstate South CarolinaPosts: 1,181
Well if you have the SLC 5/05, and the RSLogix 500 software, I would suggest you use that instead of the PLC-5. That way you will not have to tackle the Block transfer logic. The next question is do have or can you get a 1746-NT4 or NT8, for your thermocouple inputs? If so then you are all set.
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July 18th, 2005, 08:00 AM #11 roomi117 Member
Join Date: Jul 2005Local Time is: 10:33 PM Location: LahorePosts: 11 As I have mentioned that I have 3 analog inputs and 3 digital inputs so what do you suggest wicht module should I use. roomi117 View Public Profile Send a private message to roomi117 Find More Posts by roomi117 Add roomi117 to Your Buddy List
July 18th, 2005, 08:05 AM #12 Ken Moore Member
Join Date: May 2004Local Time is: 12:33 PM Location: Upstate South CarolinaPosts: 1,181
The 1746-NT4 will take care of the analogs, as for discrete it depends on voltage, and a few other varibles. Sounds like you just have contact closure devices, that is nothing electronic.So you could get by with several different input modules. Do you have any 1746 input modules on hand? You are also going to need an output module for the solenoids, what are the specifications for the solenoids?Do you have a chassis? a power supply? Come on we're trying to help, but you are being very stingy with your information.
If you would give us a more complete idea of what you have and what exactly you are trying to do, we wouldn't have to keep asking so many questions. You are answering detailed questions with simple answers, notthe best method of exchanging information.
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July 18th, 2005, 08:42 AM #13 roomi117 Member
Join Date: Jul 2005Local Time is: 10:33 PM Location: LahorePosts: 11 Yes i have got the Digital input and out put modules and Power Supply But you see my main problem is how to program the three Thermocouples. Can you send me program involving three thermocouples at the input module. I can arrange the 1746-NT4 or the 1771-IXE modules. roomi117 View Public Profile Send a private message to roomi117 Find More Posts by roomi117 Add roomi117 to Your Buddy List
July 18th, 2005, 08:54 AM #14 Ken Moore Member
Join Date: May 2004Local Time is: 12:33 PM Location: Upstate South CarolinaPosts: 1,181 Here's a link to th 1746-NT4 user's manual, it has examples and is pretty straight forward.http://literature.rockwellautomatio...um007_-en-p.pdf/
You have to configure the card for the type of thermocouple, and for degrees F or C. All the scaling etc.. is handled in the module.
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July 18th, 2005, 12:13 PM #15 Ron Beaufort Member
Join Date: Jul 2002Local Time is: 12:33 PM Location: Charleston, SCPosts: 1,401 let's do it the hard way ...
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Greetings Naeem,
you said:
Quote:We can use PLC-5 processor & 1771-IXE as mentioned by Ron. I have downloaded a few PDFs regarding the BTW and BTR commands but I am not clear completely as how to use these for more than one anlog input.
let’s proceed along those lines ... you can always use the SLC-500 system later ... below is an example of the 1771-IXE module’s configuration screen ... you’ll find this under the IO Configuration feature in the RSLogix5 software - after you “insert” the module in the proper slot on the “display chassis” screen ...
The example shows a 1771-IXE/C module which I often use in the lab for student exercises ... presently it has one J-type thermocouple connected to Channel 1 ... you can see the room temperature (71 degrees F.) indicated by a red arrow ...
note (as highlighted) that the data from the thermocouple at Channel 1 is located at N10:3 ... data from all of the other seven channels is presently reading “2192” because no thermocouples are connected there ... if there were thermocouples connected to those channels, then their readings would be located at N10:4 through N10:10 ... I know that this particular example is working because I can hold the tip of the thermocouple between my fingers and watch the temperature indication rise on the screen ...
Another interesting note: if you’ll press the handy “Insert Ladder Rungs” button on this screen, then RSLogix5 will actually write the ladder logic rungs for you ... I’ve attached a couple of files that you might find helpful ... if you have any further specific questions, then it would be a good idea to list ALL of the hardware and software that you have available ... as you can see, we can offer you very detailed help with your project - but only if we know enough about your hardware and software to give specific answers ... good luck ...Attached Files
TRYIXE.pdf (68.8 KB, 7 views)
TRYIXE.ZIP (25.9 KB, 6 views) __________________
Best regards,
Ron
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Last edited by Ron Beaufort : July 18th, 2005 at 12:16 PM. Ron Beaufort View Public Profile Send a private message to Ron Beaufort Find More Posts by Ron Beaufort Add Ron Beaufort to Your Buddy List
B)
La siguiente consulta es acerca de como direccionar Remote I/O desde un SLC500 5/03 y su respuesta.
LIVE PLC Questions And Answers RIO on AB1771 rack Posts: 204 RIO on AB1771 rack
Right here's the situation we have an old PLC2 which we (the techs) want rid of how ever the Boss is not keen on giving us the cash to rip it out and start again.So plan B we remove the processor from the PLC 2 and fit in its place a remote I/O adapter module AB 1771ASB then take a spare 4 slot SLC rack with a 5/03 in it and fit a remote I/O scanner AB1747SN and away we go(we'll convert the PLC 2 prog to SLC no problems).Now can any one give me some advice on what to watch out for if we do this ?
Thanks Jezz
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September 30th, 2003, 04:11 PM #2 randylud Member
Join Date: Oct 2002Local Time is: 12:56 PM Location: Greensboro,NCPosts: 745 Go for it!
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Jezz, you are about to have the time of your life if you have never done RIO before.
The AB knowledge base at http://domino.automation.rockwell.c...earch/?OpenForm is a great source for info, especially if you get in trouble. However, the SLC and associated RSLogix software make the RIO link set up a snap. Just be sure you look over the RIO cable requirements and terminate it correctly and you should have no problems. Just remember that the 1771 I/O rack will show up as just I/O in the SLC data table and it is up to you to know which ones are for what. It is really easy since the 1771 rack will be labeled based on where your RIO Scanner module is in the SLC rack. It is a great plan, go for it.
Thunder is good, thunder is impressive;but it is lightning that does the work!Mark Twain-8/28/1908 randylud View Public Profile Send a private message to randylud Visit randylud's homepage! Find More Posts by randylud Add randylud to Your Buddy List
September 30th, 2003, 05:28 PM #3 drewcrew6 Member
Join Date: Apr 2002Local Time is: 12:56 PM Location: allentown, PaPosts: 383 Is dropping a plc5 proc. into the rack a possibility? That has been done on a couple of our older machines. Fortunatly the machines have a newer twin that had 5's in them so we didn't have to rewrite the program.
Drewcrew6
We're all hereCause were not all there!
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September 30th, 2003, 06:18 PM #4 Allen Nelson Member
Join Date: Apr 2002Local Time is: 12:56 PM Location: West Chester, PAPosts: 1,369 Watch out??
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I remembered this thread:http://www.plctalk.net/qanda/showth...s=&threadid=965
but that gotcha only involves PLC-5's, not ASB, and PLC-2 racks. You might want to doublecheck the principle, though, namely that certain chassis may not be compatible with the ASB.
I also remember another thread about how certain PLC-2 racks don't support more than 8-bit I/O modules. This shouldn't be a major hurdle, but it could cause confusion on your expected addressing.
Otherwise, I agree with drew, have a ball.
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September 30th, 2003, 06:21 PM #5 randylud Member
Join Date: Oct 2002Local Time is: 12:56 PM Location: Greensboro,NCPosts: 745 1771 I/O racks are just that, racks.
It is the plc that determines wheather you can do certain things regarding I/O addressing etc.
Thunder is good, thunder is impressive; but it is lightning that does the work!Mark Twain-8/28/1908 randylud View Public Profile Send a private message to randylud Visit randylud's homepage! Find More Posts by randylud Add randylud to Your Buddy List
September 30th, 2003, 09:05 PM #6 Eddie Willers Member
Join Date: May 2002Local Time is: 09:56 AM Posts: 164 Knowbase document A16647 is indespensable when converting PLC-2 hardware to modern A-B controllers.
http://domino.automation.rockwell.c...3C?OpenDocument
You ought to be able to put a 1771-ASB into this chassis without any trouble.
Post a list of the I/O modules and maybe people on the Forum who are familiar with the 1747-SN can give you an example of how the former PLC-2 data table will be represented in the SLC-500 data table. Eddie Willers View Public Profile Send a private message to Eddie Willers Find More Posts by Eddie Willers Add Eddie Willers to Your Buddy List
October 1st, 2003, 10:10 AM #7 Jezz Member
Join Date: Dec 2002Local Time is: 05:56 PM Posts: 204 The I/O that's already in the rack is as follows
6 * 32 point DC input cards 1771-IBN
5 * 32 point DC output cards 1771-OBN
3 * 16 point 110v ac output cards 1771-OAD
We have all ready looked at getting a PLC 5 and just slotting that in but then on top of the cost of the processor we would need software we have RS Logix 500 on site all ready and are all familiar with it Jezz View Public Profile Send a private message to Jezz Visit Jezz's homepage! Find More Posts by Jezz Add Jezz to Your Buddy List
October 1st, 2003, 02:39 PM #8 john paley Member
Join Date: Apr 2002Local Time is: 11:56 AM Location: TennesseePosts: 275
Jezz,
I did the same thing with 2 racks of old 1771 i/o. The only thing is I had no 32 bit cards--this means 1/2 slot addressing--which the chassis is set up for already. But I don't know how the 1747 scanner handles it, for sure.
6 * 32 point DC input cards 1771-IBN
5 * 32 point DC output cards 1771-OBN
3 * 16 point 110v ac output cards 1771-OAD
That's 14 slots but 25 groups or words.
The 1747-sn alloows 32 so I think your OK.
I had 2 16 slot racks so each one was actually configured as 2 logical racks--single slot addressing--your one 16 slot rack will be configured as 4 logical racks---1/2 slot addressing.
The tricky thing here is that you'll have 32 words of data all referenced to the slot of the SLC where the SN module is--I:1.0/0 thru I:1.31/15.
In your case if there's a 32 bit card in your first slot, it will be words 0 and 1 in the SN slot. Point is, it's not as easy to look at the SLC address on a printout and readily find the physical I/O ppoint in the rack--because you lose the slot/bit info to the word/bit stuff.
Another thing--
I:1.0/08 in the SLC equates to I:0/10 at the physical input point.
The 1771 cards are octal--the SLC I/O table is decimal.
If you would assign symbols to the SLC bits that relate to the physical I/O and it would be helpful. ie I_0_10.
Good luck,have fun
The Big Cheese john paley View Public Profile Send a private message to john paley Find More Posts by john paley Add john paley to Your Buddy List
October 2nd, 2003, 08:28 AM #9 PhilipW Member
Join Date: Dec 2002Local Time is: 05:56 PM Location: Wellington, New Zealand. Islands on the edge of the world.Posts: 821
I did exactly this conversion once on a Banbury Rubber Mixer in a Tyre plant. All the above is true, however I do recall one oddity that caught me unawares.
It turned out that the SLC scanned a lot faster than the PLC2 and in the program I converted this caused a very obscure bug. I can't recall the exact details of the bug, but in general you may just want to keep this thought tucked away in the back of your mind as a possible source of problems.
Overall the conversion is a bit of a b**** and I wouldn't volunteer to do it again. Nothing converts smoothly from octal to decimal and either you finish up by converting most of the code literally into less than elegant SLC program, or you finish up re-writing the whole damm thing from scratch.
Complacency is not an enduring condition.
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Last edited by PhilipW : October 2nd, 2003 at 08:32 AM.
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October 2nd, 2003, 11:05 AM #10 Jezz Member
Join Date: Dec 2002Local Time is: 05:56 PM Posts: 204
Two questons :-
1. Hows my I/O going to apearslots 1 to 6 are 32 point Inputs Slot 7 is 32 point outputSlot 8 is emptySlot 9 to 12 are 32 point outputsslots 13 to 15 are 16 point outputs
2. Whats 1/2 slot 1 slot and 2 slot
Thanks Jezz Jezz View Public Profile Send a private message to Jezz Visit Jezz's homepage!
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C)
El siguiente caso incluye una explicación más detallada de un técnico que evidenciaba bastante conocimiento de como producir el cambio y ofrece también una forma de configuración bastante aproximada.
AB RIO Again.
JezzDecember 8th, 2003, 03:34 PM
Hi All,I'm still having problems with my RIO instillation I'm using a AB 1747-SN scanner to talk to a AB 1771-ASB Series E adapter the fault I'm getting is that the Active and Adapter fault lights are flashing in unison the book says this is a Incorrect Starting I/O Group number and that I need to set the dip switches according to the table (I've done this and no change).The rack I'm using is an old PLC2 rack(AB1771-A4)it has some 32 point I/O in it but I've set the Adapter to be ok with this and now I'm running out of ideas Help please this is driving me crazy banghead
Big Thanks Jezz
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john paleyDecember 8th, 2003, 03:52 PM
I think there was a thread posted here about those old racks a few weeks ago. It seems that there was an issue between series a and series b racks. I think the a's won't work with 16 point i/o but the b's will. Check with AB and your specific rack catalog #. Doesn't sound like your problem exactly, but you never know with the old stuff.
Were you using 32 point cards with the PLC 2 ????
Do the rack dip starting rack/group match the 1747-sn config???
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Ken RoachDecember 8th, 2003, 04:01 PM
If it's really a "1771-A4" chassis, it is only going to support 8-point I/O modules, no matter what kind of adapter you put into it.
You're going to need a 1771-A4B chassis (in production since 1985 !).
There is an A-B technote, # A16647, that goes over all the technical considerations when re-using PLC-2 hardware with newer controllers.
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JezzDecember 8th, 2003, 04:08 PM
sorry Ken it is a 1771-A4B chassis
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Ken RoachDecember 8th, 2003, 05:17 PM
Okay, it's time to get dirty with the DIP switches.
Post the DIP switch settings you have for the 1771-A4B chassis, the 1771-ASB/E adapter, and the settings you've made in RSLogix 500 advanced I/O configuration for the G-file of the 1747-SN, which sets up the various I/O addresses you want the scanner to scan.
JezzDecember 9th, 2003, 10:19 AMHere You go Ken
Right the Chassis first
It contains
6 * 32 point DC input cards 1771-IBN
5 * 32 point DC output cards 1771-OBN
3 * 16 point 110v ac output cards 1771-OAD
In These positions
slots 1 to 6 are 32 point Inputs Slot 7 is 32 point output
Slot 8 is emptySlot 9 to 12 are 32 point outputsslots 13 to 15 are 16 point outputs
1 - Off
2 - On
3 - Off
4 - Off
5 - Off
6 - On
7 - Off
8 - Off
The 1771-ASB series E Adapter
S1
1 - 0n
2 - On
3 - 0n
4 - On
5 - 0n
6 - On
7 - 0n
8 - On
S2
1 - On
2 - Off
3 - Off
4 - Off
5 - Off
6 - Off
RIO Scanner 1747-SN
Dip Switches set to 57.6K Baud
Advanced config
Max Input words:32
Max Output words:32
Scanned Input Words : 32
Scanned Output Words :32
Interrupt service routine:0
M0 Length :3300
M1 Lenght :3300G
File Length :3
G file Data
Group 0 in each Logical Rack set to Full Rack Giving me I/O Words0 to 31
Thanks Jezz
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JezzDecember 9th, 2003, 03:36 PM
Found the problem had the chassis dip switches inverted on when they should have been off and off when they should have been on..
Just a few bug in the software to sort now ..
Thanks to every one who offered help over the past few weeks it's made my life a lot easer.....
john paleyDecember 9th, 2003, 03:47 PM
It seems I remember something confusing about the dip switch markings on that adaptor module, I'm not sure what it was, but it was easy to get them backwards.
D) Mi experiencia al respecto.
En lo sucesivo voy a tratar de volcar de la mejor manera posible mi experiencia adquirida en relación al Up grade que me tocó hacer a un equipo que tenía instalado un sistema 1771 como PLC 2/30 y que tenía 2 racks locales y uno en romote I/O a través de un tarjeta 1771-SD2, configurado en el año 1988.
El sistema quedó finalmente funcionando con los 3 racks del sistema 1771 existentes conectados directamente a un nuevo rack local de sistema 1746 SLC500 con un scanner 1747-SN/B. Además se le agregó un pequeño rack de la familia 1794. O sea que quedó constituído un sistema con SLC500 5/05 y 4 racks remotos todo esto a través de RIO.
Para lograr esto tube que sortear varios inconvenientes que quisiera compartir.
Me encontré que para poder mantener una buena comunicación entre todos los ASB (que ahora son 4 y no 1 como en el diseño previo) y el módulo scanner 1747-SN/B, fue conveniente setear a 57600 baudios.
Sin embargo, en uno de los racks que pasó de ser local en PLC-2 a ser remoto para el SLC-500 existía un módulo 1771-IKC que es un contador de alta velocidad con un encoder AB open collector, por causa de la velocidad de actualización de la lectura en formato BCD tube que cambiarlo por un módulo 1746-HSC en el rack lócal.
Gabriel.
