4

presently±unavailable modules. Alternatively, you can could configure the existing equipment with Auto I/O Map ON, then turn it OFF and edit the length fields to provide space for the future modules, You need to plan this early; if you don't leave enough room for future modules, extensive reconfiguration may be required later on.

If some I/O will not be scanned by the central PLC:

I/Odata that is assigned to references outside the I/O map will not be exchanged with the PLC during system operation. Such references would be controlled by an intelligent module in the Remote Drop, as described in chapter 3. References outside the I/O map can be located anywhere in the Remote I/O Scanner's I/O memory.

I/O Map

Outside I/O bMap

Module Reference Addresses

For this type of application, Auto I/O Map can be turned OFF for part or all of the Remote Drop configuration:

A.You can turn Auto I/O Map OFF before configuring any modules and enter in the I/O Map lengths for each data type to be exchanged with the PLC. Then, configure references for individual I/O modules that fall either inside or outside the I/O map, as needed.

B.Or, you can begin with Auto I/O Map turned ON, and use it to configure all modules that should be included in the I/O map. When you reach the point where I/O references should be outside the I/O map, return to the Remote I/O Scanner's configuration screen, and turn Auto I/O Map OFF. The rest of the modules you subsequently configure for this drop will be outside the I/O map.

Bus Scan Time Impact

As data lengths are incremented, either by entering them in the I/O map or with automatic I/O mapping, the configuration software calculates the total number of input and output bytes, and the amount of time the quantity of I/O specified will add to the scan time of the Genius bus, based upon the configured baud rate. This information is shown on the first Remote I/O Scanner configuration screen (this information cannot be edited):

The Bus Scan Impact is the amount of time that will be added to the scan time of the bus on which the Remote I/O Scanner is located by the quantity of data to be exchanged with the host.

Chapter 4 Configuration with Logicmaster 90±70

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GE GFK0579B user manual Bus Scan Time Impact, If some I/O will not be scanned by the central PLC
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GFK0579B specifications

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