GFK-0356Q Chapter 1 Overview of the Series 90-30 PLC 1-7
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What if the application requires more than ten modules?
You can add one or more Expansion or Remote racks to this system. Some CPUs can support up to
seven additional racks. If you added seven additional 10-slot racks, you could have 70 more
modules.
Racks are interconnected in a “daisy-chain” cabling arrangement. This interconnection system is
called the “I/O Expansion Bus.” The connections are made from one baseplate’s I/O Bus
Expansion Connector (shown in the figure above) to the next one’s. The I/O Bus Expansion
Cables, shown below, have a double connector on one end to facilitate these connections.
Male Connector
Male Connector
Female Connector
Figure 1-8. I/O Bus Expansion Cable
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