5

4.The autotest master pulse tests Block A. Any faults on block A are noted.

Block A Pulse-tested.

A

Load

BFailed Switch outputs still overridden OFF.

Block C outputs still

C

overridden ON

 

D

5.The master resets all four blocks in the output group.

6.Overrides on block C are cancelled.

A

Load

BFailed Switch outputs still overridden OFF.

Block C output overrides

C

cancelled.

 

D

7.The master cancels overrides on block B except for any outputs that have tripped erroneously.

A

Load

BOverrides conditionally cancelled.

C

D

8.The autotest master repeats the above process for blocks D/A/B, then A/D/C, then B/C/D.

9.The autotest master reports faults to the other PLCs (if any). All the PLCs log any faults that occur into their Fault Tables.

10.The autotest master continues testing with the next group.

GFK-0787B

Chapter 5 Diagnostics

5-9

Page 69
Image 69
GE GFK-0787B user manual Block a Pulse-tested