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Installation
Maximum Configuration in Remote I/O Drops
Maximum Configuration
The maximum number of I/O modules in an Modicon X80 remote I/O drop (with both a main remote
rack and an extension remote rack) using a BM• CRA 312 •0 adapter depends on the CPU used
in the main local rack.
Refer to your system hardware reference manual toensure that you select a CPU that supports the
number and types of I/O modules you need.
This table shows the maximum number of modules in a remote I/O drop with a remote extension
rack:
Module Type
Number of Modules in a Drop
remote I/O adapter
1
power supply
2
bus extension
I/O(2)
(1)
2
Depends on the CPU and platform used
(1) A bus extender attaches to the end of each rack and does not use a rack slot.
(2) Refer to the list of modules that remote I/O installations support (see page 22).
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