Rockwell Automation 1791-XXXX Discrete I/O AC and DC Block I/O Input and Output Modules - Manual (Page 55)

Installing Block I/O
Chapter 3
3-36
Blocks must be wired in series as shown in Figure 3.25 or Figure 3.26. Do
not attempt to wire any block in parallel.
The number of blocks used depends not only on the user requirements but
also on the system used. Refer to Table 3.A (page 3-1) for maximum
block usage for individual systems.
Figure 3.25
Series Connection for Block I/O Using PLCĆ2, PLCĆ3 or PLCĆ5 Family
Programmable Controllers
Install terminating resistor on last block.
To Programmable Controller
or I/O Scanner Module
1 I/O Rack
1 I/O Rack
1 I/O Rack
1 I/O Rack
10833ĆI
Remote I/O Link Wiring