6

Hold Last

If the block will use Input Autotest, circuit 16 must be configured as an

State

output, as explained above. For circuit 16, Hold Last State must be

 

configured to NO.

Output

If the block will use Input Autotest, circuit 16 must be configured with

Default

Output Default set to ON.

Redundancy Portions of the overall system can be configured for no CPU redundancy,

Mode duplex redundancy, hot standby redundancy, or GMR mode. (See page 5-3 for information about how the configured Redundancy Mode affects Fault Reporting by blocks in the GMR system).

For 16-circuit and 32-circuit DC blocks, select GMR mode for blocks that will be part of input or output groups as described in this book. Individual circuits on the blocks can be configured (using the GMR Configuration Software) to utilize the special GMR features. GMR mode can be selected even if there is just one block in an input group, and it should use the extra diagnostics capabilities provided by GMR.

Select no redundancy for non-critical individual blocks that do not require any type of redundancy.

The duplex CPU redundancy selection is for blocks on a bus with two PLCs. This is not the same as duplex GMR redundancy. Conventional duplex CPU redundancy, which is described in the Genius I/O System User's Manual does not provide autotesting, or the other special features of GMR described in this book.

Hot standby CPU redundancy can be selected for blocks in a GMR system. Instead of voting on CPU output data, blocks that are set up for hot standby mode give preference to outputs received from bus controller 31. Should outputs from 31 fail, a block in hot standby mode starts using outputs received from bus controller 30. Finally, should outputs from 30 fail, the block will use outputs from bus controller 29. (Only the specific types of enhanced 16-circuit and 32-circuit DC discrete blocks listed in this book are capable of receiving outputs from bus controller 29. Other types of blocks can only receive outputs from bus controllers 30 and 31.)

GFK-0787B

Chapter 6 Configuration

6-53

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Image 141
GE GFK-0787B user manual Configuration