Bradley Smoker PLC-5 user manual 10Communicating with Remote I/O

6-10Communicating with Remote I/O

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If you need multiple updates to an I/O device during an I/O scan, you can enter a logical address in the scan list more than one time. Do not assign the same partial or full rack address to more than one channel in scanner mode. Each channel must scan unique partial and/or full rack addresses.

Keep these limitations in mind when creating/modifying a scan list:

•The automatic configuration always displays the actual hardware configuration, except for racks that have their global-rack inhibit bit set. In this case, the global-rack bit overrides the automatic configuration. You must first clear the global-rack inhibit and then select autoconfigure.

•Clear global-rack inhibit bits for the channel that scans the racks that you want to resume scanning. Use the scanner mode status screen in your programming software.

•If you change a channel configuration from adapter or DH+ mode to scanner mode, use the clear list function of your programming software to clear the scan list. In any other instance where you need to clear entries from the scan list, use the delete-from-list function to delete the entries one at a time.

Publication 1785-UM012D-EN-P - July 2005