5

GMR Autotesting

The GMR software automatically performs autotesting on discrete inputs and outputs that have been configured to be autotested. Analog inputs and outputs are not autotested by the GMR software. GMR autotesting can be used in a system with one, two, or three PLCs.

Autotest Sequence

GMR autotesting goes on at the configured interval (0 to 65535 minutes) during system operation. Each PLC in turn controls the sequence.

PLC A

PLC B

PLC C

'

'

1. Autotest GMR inputs

1. Autotest GMR inputs

1. Autotest GMR inputs

2. Complete GMR

2. Complete GMR

2. Complete GMR

output autotest

output autotest

output autotest

3. Pass autotest control

3. Pass autotest control

3. Pass autotest control

to next PLC (here, B).

to next PLC (here, C).

to next PLC (here, A).

If one or two of the PLCs are not available, autotesting continues with the remaining PLC(s).

During its turn as the autotest master, a PLC tests all input and output groups that are set up for autotesting. These may include the following types of groups:

Input groups: non-voted (1 block) simplex (1 block) duplex (2 blocks) triplex (3 blocks)

Output group: 4-block redundant

5-4

GeniustModular Redundancy Flexible Triple Modular Redundant (TMR) System

GFK-0787B

 

User's Manual ±March 1995

 

Page 64
Image 64
GE GFK-0787B user manual GMR Autotesting, Autotest Sequence