RSLogix5 Remote I/O Diagnostic File interpretation

RonJohn · May 4, 2022

I could use some help figuring out the layout of a Remote I/O channel Diagnostic Files in a PLC5 using RSLogix5. I've attached a screen shot of the Channel 1B configuration properties popup. There are several rack adaptors on this channel, varying in size from 1/2 to full rack. I have N53 designated as the Diagnostic File.

What I need to know is how this data is mapped out in the N53 diagnostic file. Specifically, I need to know where the fault bits are for each rack adaptor so that I can monitor and display on an HMI.

I'm sure I knew this info 25 years ago but shame on me for not being able to find it now, LOL! Thanks in advance for your help.

RSLogix5 Channel Configuration Display.JPG

Mispeld · May 4, 2022

We typically use the processor status file (S2) for rack status (e.g., Fault). Refer to the "Rack" tab on the structured view of S2 for address and bit references.

RonJohn · May 4, 2022

Mispeld said:
We typically use the processor status file (S2) for rack status (e.g., Fault). Refer to the "Rack" tab on the structured view of S2 for address and bit references.

Thanks Mispeld. That's what we use currently also. However, this is problematic when there are more than one RIO adaptor for a single logical rack (like rack 6 in the original screen shot - two half racks). Unless I'm mistaken, there's no way to distinguish which adaptor is faulted via monitoring S:7/6.

Ron

celichi · May 4, 2022

https://literature.rockwellautomation.com/idc/groups/literature/documents/um/1785-um012_-en-p.pdf

Staring at Page 93

drbitboy · May 4, 2022

P.S. you can add #page=N to PDF links and it will go that that ordinal page number (not necessarily the document-internal page number e.g. if the is a preface with pages i, ii, iii, iv, etc.).

https://literature.rockwellautomati...ure/documents/um/1785-um012_-en-p.pdf#page=93

Mispeld · May 4, 2022

OK, now I see what you're looking for. Per the referenced manual, I would take it that the fault bit for first half of rack #6 would be N53:12/0, and the second half rack N53:12/2. (Should probably be checked and confirmed.)

Good to know because we just alarm on the whole rack, and this group information would be useful for the PLC-5's still hanging around.

RonJohn · May 4, 2022

celichi said:
https://literature.rockwellautomation.com/idc/groups/literature/documents/um/1785-um012_-en-p.pdf
Staring at Page 93

Thanks celichi - this is EXACTLY what I needed! I realize now that I was looking at the Classic PLC5 manual earlier, not the Enhanced PLC5.

P.S. you can add #page=N to PDF links and it will go that that ordinal page number (not necessarily the document-internal page number e.g. if the is a preface with pages i, ii, iii, iv, etc.).

https://literature.rockwellautomatio...-p.pdf#page=93

Thanks drbitboy, that's pretty cool!

Mispeld, I agree with your take & appreciate your input. As so many of the older controls guys leave the industry, I'm finding such knowledge to be indispensable.

Cheers!
Ron

celichi · May 4, 2022

drbitboy said:
P.S. you can add #page=N to PDF links and it will go that that ordinal page number (not necessarily the document-internal page number e.g. if the is a preface with pages i, ii, iii, iv, etc.).

https://literature.rockwellautomati...ure/documents/um/1785-um012_-en-p.pdf#page=93

Thanks, that is handy.

I can go to sleep now as I have filled my quota for learning something new everyday.

Operaghost · May 4, 2022

RonJohn said:
...Mispeld, I agree with your take & appreciate your input. As so many of the older controls guys leave the industry, I'm finding such knowledge to be indispensable.

Cheers!
Ron

I think we've all just been called old (not that it is the first time)

OG

RonJohn · May 4, 2022

It's a badge of honor, OG! Coming up on 30 years in the field myself, now I'm teaching the young'uns here about octal addressing and conserving memory!

Operaghost · May 4, 2022

drbitboy · May 4, 2022

Some say there's no fool like an old fool, but ya don't get to be old bein' no fool.

-- Richard Pryor (as his Mudbone character)

-

Operaghost · May 4, 2022

drbitboy said:
Some say there's no fool like an old fool, but ya don't get to be old bein' no fool.

-- Richard Pryor (as his Mudbone character)

-

Loved Mudbone... "Damn, this water's cold...Yeah, and it's deep too" is one of the funniest lines for me still to this day.

OG

drbitboy · May 4, 2022

Operaghost said:
"Damn, this water's cold...Yeah, and it's deep too" ...

O yeah, and don't forget

"And that's when I got in that tractor, and came up here."

LOL.

RonJohn · Sep 2, 2022

I thought it might help future readers to post a clarification. The I/O Status File is what contains the necessary information, not the Channel Diagnostic Files. To get more info on this file, simply go a few pages earlier in chapter 6 of the same manual. Link below...

https://literature.rockwellautomation.com/idc/groups/literature/documents/um/1785-um012_-en-p.pdf#page=79

RSLogix5 Remote I/O Diagnostic File interpretation

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