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Problem:
When adding I/O registers to be read from a modular Allen-Bradley SLC, the connected client receives errors in the KEPServerEX Event Log. If the client is an OPC client, it will receive error code "0xC0040007 - The item is no longer available in the server address space".

Possible Cause:
During device creation, the slots were not configured with the I/O card information (which validates register addresses during tag creation).

Solution:
Open the device's Device Properties, and then configure the SLC's slots with the appropriate card configuration. All slots should be configured.