I agree that you're going to want to look at the actual I/O image while observing the indicators on the modules themselves to help verify that your assumptions are correct.
The paired 32-point modules are typical of '1-slot' addressing.
'1-slot' addressing means that each physical slot is allocated one logical 'Group', which has 16 bits of Input data and 16 bits of Output data.
Putting a 32-bit Input module into Rack 01, Group 0 means that it will use up Word 0 and Word 1 of the Input data table. That makes Word 1 of the Input data table unavailable to a module located in the adjacent slot.
But that's OK; the next slot is occupied by a 32-bit Output module, which will use Word 0 and Word 1 of the Output data table.
Check the BTR and BTW instructions for the analog modules in Rack 0, and you'll probably find the ones for the Analog Output module are addressed to 'Group 5, Slot 0'.
The labels on this chassis, of course, also bolster the conclusion that it's set up for 1-Slot addressing.
Other chassis out along the RIO chain might be set up differently.
Stock up on graph paper, practice counting in Octal, and good luck !
The paired 32-point modules are typical of '1-slot' addressing.
'1-slot' addressing means that each physical slot is allocated one logical 'Group', which has 16 bits of Input data and 16 bits of Output data.
Putting a 32-bit Input module into Rack 01, Group 0 means that it will use up Word 0 and Word 1 of the Input data table. That makes Word 1 of the Input data table unavailable to a module located in the adjacent slot.
But that's OK; the next slot is occupied by a 32-bit Output module, which will use Word 0 and Word 1 of the Output data table.
Check the BTR and BTW instructions for the analog modules in Rack 0, and you'll probably find the ones for the Analog Output module are addressed to 'Group 5, Slot 0'.
The labels on this chassis, of course, also bolster the conclusion that it's set up for 1-Slot addressing.
Other chassis out along the RIO chain might be set up differently.
Stock up on graph paper, practice counting in Octal, and good luck !
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This is how I keep it straight.
If you want your card arrangement totally unrestricted, it follows this pattern:
2-slot addressing = 8 point cards
1-slot addressing = 16 point cards
1/2-slot addressing = 32 point cards
I think of this as the 'default' configuration.
If you can tolerate alternating input cards and output cards in pairs, it follows this pattern:
2-slot addressing = 16 point cards
1-slot addressing = 32 point cards
1/2-slot addressing = not useful
I think of this as the 'upgrade' configuration. Many older PLC-2 and PLC-5 PLCs were originally installed with 8 point cards and 2-slot addressing. Over the years they were upgraded by replacing 8-point cards with 16-point cards. For example, if you had 2 8-point output cards in the same module group, you could replace them both with one 16-point output card and gain a spot for a new 16-point input card.
I don't think I would ever build a new system with alternating input and output cards. The ratio is usually more like 4 inputs for every output in my experience so I don't find that arrangement very useful. But when you need to squeeze a few more I/O into an existing system, definitely.
This is how I keep it straight.
If you want your card arrangement totally unrestricted, it follows this pattern:
2-slot addressing = 8 point cards
1-slot addressing = 16 point cards
1/2-slot addressing = 32 point cards
I think of this as the 'default' configuration.
If you can tolerate alternating input cards and output cards in pairs, it follows this pattern:
2-slot addressing = 16 point cards
1-slot addressing = 32 point cards
1/2-slot addressing = not useful
I think of this as the 'upgrade' configuration. Many older PLC-2 and PLC-5 PLCs were originally installed with 8 point cards and 2-slot addressing. Over the years they were upgraded by replacing 8-point cards with 16-point cards. For example, if you had 2 8-point output cards in the same module group, you could replace them both with one 16-point output card and gain a spot for a new 16-point input card.
I don't think I would ever build a new system with alternating input and output cards. The ratio is usually more like 4 inputs for every output in my experience so I don't find that arrangement very useful. But when you need to squeeze a few more I/O into an existing system, definitely.