Allen-Bradley PLC-2/30 - System Configurations

Addressing
Appendix A
A16
4/5, etc.) or they will not work. (Some two-slot B.T. modules use the lower
slave bus on the I/O chassis backplane for intramodule communication.)
The PLC-2/30 processor can communicate with the local and remote I/O.
Its addressing modes are dependent upon what it is addressing (local or
remote I/O) and how it is communicating with its I/O modules.
If you have a PLC-2/30 communicating with a local I/O chassis through
a 1771-AL Local I/O Adapter module, you can only use 2-slot
addressing.
If your PLC-2/30 is communicating to a remote I/O chassis through a
1771-ASB (Series A) Remote I/O Adapter module (and the needed
1772-SD2 Remote I/O Scanner/Distribution panel), you can use 2-slot
or 1-slot addressing. See publication no. 1772-2.18 for addressing
information.
If you are communicating with a remote chassis through a 1771-ASB
(Series B) remote I/O Adapter module (and the needed 1772-SD2
Remote I/O Scanner/Distribution panel), you can use 2-slot, 1-slot or
1/2-slot addressing. See publication no. 1771-6.5.37 for detailed
addressing information. There are two factors that determine or limit
what addressing mode you may use. They are:
The 1771 Universal I/O chassis series (A or B).
The I/O Adapter (1771-AL, 1771-AS, 1771-ASB (Ser. A), 1771-ASB
(Ser. B)
The following table presents the possible combinations of addressing with
Series B 1771 Universal I/O chassis versus various I/O adapters.
With Series A chassis, only 8-point modules may be used. No 16- or
32-point can be used in any configuration.
A.3
System Configurations
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