Reading PLC 5 Data File

[oOICEMANOo]

When trying to read a PLC5/40B using DHRIO I can get values using say B17:5/1 but when I try to read if a output is on ex. O:051/3 I get a ErrorBadParam. Is it possible to read the output file?

CIP Path: 1,2,A:5:5

[timyhac]

Hi @oOICEMANOo - I have never used PLC5 but you may get more luck by adding detail to your question such as suggested in the Contributions guidance.

[kyle-github]

This is not fixed yet but there is an issue tracking it.

Also note that all numbers must be DECIMAL only. Octal is not currently supported.

[raentzmi]

Couple notes when reading this thread. PLC 5's were some time ago... The format of the Input and Output if you did not know is Rack-Module- so the example of O:051/3 is Rack 05 Module1 bit 3 - of which all three numbers are in Octal. For Logix the use of a period for the bit address has always been used - for PLC 5 and SLC the \ has been used. Not sure how the library does this or not. I find it interesting that CIP routing is available and that's Great! In the short term I would suggest moving the Output table to a file of your choice (i.e. BXX) then use this file instead of the I/O tables. This opens up some interesting things you can do with this new table - look at FBC and DDT. The PLC 4 is synchronous with the I/O scan so I would do this at the top of the program for the input table so you have the current state of the inputs and do the outputs at the end of the program. If you do this you only need to worry about what outputs changed state in the last scan - and the I/O that is part of any block transfers if you have them. In the case of block transfers you should copy the results out on the done bit - this is a good practice as the DN bit signals that the contents of the block is valid. If you don't do this you can execute logic on data that is invalid. Rob Entzminger

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On Sat, Jun 15, 2024 at 1:45 AM Kyle Hayes ***@***.***> wrote: This is not fixed yet but there is an issue <libplctag/libplctag#465> tracking it. Also note that all numbers must be *DECIMAL* only. Octal is not currently supported. — Reply to this email directly, view it on GitHub <#360 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AL4TWK4XRSAKXSGDMD6SEDDZHPPIZAVCNFSM6AAAAABJLM2X3SVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDCNRZGE3DINJYGA> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[kyle-github]

Hmm, @raentzmi, that is the most cogent argument I've heard for a while about why to support octal. Is there something that lets you know the number is octal? Leading zero? If so, I will prioritize the parsing of data-file style names.

I did only a little programming of PLC/5 systems. Almost all the times I touched them it was converting a PLC/5 to a ControlLogix. Or a PLC/5-250 to a ControlLogix (every tried to find parts for those things?).

You can get to the O file, but you need to put in the data file number, which is zero. Similarly the I input data file needs the data file number which is 1 (one).

I actually have a PLC/5 and a MicroLogix, so I can do some testing eventually.

[raentzmi]

It's my understanding that Input and Output data types can only be Octal. I want to also say that you can't have an O20:051/10 - meaning Output data type file 20... The use of Octal would be a good thing to have but I would say it's not required. Is this a bug? I would say no since there is a workaround to move the Output file data to a Binary file that can be accessed in the current form of the library. Depending on how much of the data table is needed the rungs to do this are very simple - I would say simpler than adding octal to the library. Knowing that there is a limited install base of PLC 5 (this includes PLC-5250) and SLC this would see limited useability. I will see if I can find a PLC 5 and Logix 5 to test this and maybe write a document on what I find... Rob Entzminger

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On Sat, Jun 15, 2024 at 12:23 PM Kyle Hayes ***@***.***> wrote: Hmm, @raentzmi <https://github.com/raentzmi>, that is the most cogent argument I've heard for a while about why to support octal. Is there something that lets you know the number is octal? Leading zero? If so, I will prioritize the parsing of data-file style names. I did only a little programming of PLC/5 systems. Almost all the times I touched them it was converting a PLC/5 to a ControlLogix. Or a PLC/5-250 to a ControlLogix (every tried to find parts for those things?). You can get to the O file, but you need to put in the data file number, which is zero. Similarly the I input data file needs the data file number which is 1 (one). I actually have a PLC/5 and a MicroLogix, so I can do some testing eventually. — Reply to this email directly, view it on GitHub <#360 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AL4TWK7NW4G37MXPROGK6QDZHR2AVAVCNFSM6AAAAABJLM2X3SVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDCNZQGM4TQOBUGE> . You are receiving this because you were mentioned.Message ID: ***@***.***>