In an SLC500 PLC system, the total number of modules and I/O points is limited to what can be installed in a single chassis.

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Multiple Choice

In an SLC500 PLC system, the total number of modules and I/O points is limited to what can be installed in a single chassis.

Explanation:
Expandability is the key idea here. In SLC 500 systems, you’re not limited to the I/O that fits in a single chassis. The CPU in one chassis can drive additional I/O through expansion racks connected to the same backplane system. Each expansion chassis adds more slots for I/O modules, so the total number of I/O points is the sum across the main chassis plus all expansion racks, within the limits defined by the specific CPU and backplane configuration. This means you can scale up the I/O well beyond a single chassis, rather than being confined to what fits in one rack. Always check the controller’s maximum supported expansion and total I/O for the exact model you’re using, since practical limits do apply.

Expandability is the key idea here. In SLC 500 systems, you’re not limited to the I/O that fits in a single chassis. The CPU in one chassis can drive additional I/O through expansion racks connected to the same backplane system. Each expansion chassis adds more slots for I/O modules, so the total number of I/O points is the sum across the main chassis plus all expansion racks, within the limits defined by the specific CPU and backplane configuration. This means you can scale up the I/O well beyond a single chassis, rather than being confined to what fits in one rack. Always check the controller’s maximum supported expansion and total I/O for the exact model you’re using, since practical limits do apply.

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