7

Monitoring/Controlling I/O Data:

Logicmaster 90±70

Logicmaster 90±70 can be used to monitor I/O in the remote drop, either from the

PLCI/OTables or from the Remote I/O Scanner's internalI/Otables.

Reference Tables Display from the PLC

When the system is in operation and the remote drop is communicating with the PLC via a Genius bus, the I/O in the remote drop can be monitored as part of the complete system. The Logicmaster reference tables displays will include those portions of the PLC's %I, %Q, %AI, and %AQ memory being used by a Remote I/O Scanner. For example, a remote drop uses discrete inputs %I00001 ± %I00120. In the reference tables for the PLC, these inputs are displayed along with other system inputs. When attached to the PLC, Logicmaster 90±70 can override or toggle the I/O data and cause a change.

%IReferencesusedby

RemoteI/OScanner

If the remote drop is on±line to the PLC, I/O cannot be toggled by a programmer attached to the remote drop. This is because the altered data would be immediately overwritten by the real input and output values being exchanged between the Remote I/O Scanner and the PLC.

If the system is not yet in operation or the remote drop is not transferringI/Odata with the PLC over the Genius bus, monitoring must be done at the remote drop. Either serial or parallel Logicmaster 90±70 can be used. In this situation, toggling output data is possible and can be useful in checking out circuit connections.

Chapter 7 Remote Drop I/O Data

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GE GFK0579B user manual Logicmaster 90±70, Reference Tables Display from the PLC
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GFK0579B specifications

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