FlexIO in PLC5

I'm setting up a PLC5 program for a new 1794-IB16 (FlexIO card.) In the drawings, the I/O goes from 0-15, but in PLC5 program, the card goes from 0-7 and then 8-17.

Do I need to make any changes to the program to have it work properly based on the real-word wiring?

but in PLC5 program, the card goes from 0-7 and then 8-17

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That would be 0-7 and then 10-17. That is octal as opposed to the decimal numbering in the diagrams.
It is just the original designer that had created the diagrams, probably for an SLC500 CPU and not a PLC5 CPU.
No need to change anything in the PLC5 program. All you have to figure out how the i/o is addressed. I would have the diagrams updated to reflect the PLC5 addressing.

Yeah sorry I meant 10-17. I guess what I'm wondering is if the physical IO card is 0-15, is it going to cause a problem in the PLC if it thinks it's 0-7 and 10-17 or not.

aryaf said:

Yeah sorry I meant 10-17. I guess what I'm wondering is if the physical IO card is 0-15, is it going to cause a problem in the PLC if it thinks it's 0-7 and 10-17 or not.

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You will address them with octal numbers in the PLC code. In the olden days, they used to ship labels for SLC I/O so you could change the numbers for each indicator LED from decimal to octal. I don't recall those for the PLC-5. We used to label the card that slid into the front cover to match the PLC.

The I/O card won't care, but it can be confusing for folks who are not used to the octal system when they see output but number 12 in a PLC which seems to cause an LED numbered "14" to light up...

On the 1794 Flex I/O, there is a Card you can pull out, flip over and slide back in, and it will show the Octal Address for the I/O Points.

Stu.....