5

I/O Fault Table Messages for GMR

I/OFault Table format is detailed in the Series 90-70 PLC Reference Manual (GFK-0265).

02 1F0100 00030101FF7F 0302 02 00 00 84000000000003

Fault Specific Data

Fault Description

Fault Type

Fault Category

Fault Action

Fault Group

Point

Block

I/O Bus

Slot

Rack

Reference Address

Long/Short

In the I/O Fault Table, the following additional types of messages are available for GMR:

HAutotest fault messages

HDiscrepancy fault messages

These faults have the following fields on the Logicmaster Fault Table display:

Fault Location*:

Rack

 

Slot

 

Bus: always 1

 

Block serial bus address

Circuit Number:

Block circuit number

Reference Address:

Physical I/O reference

Fault Category:

Circuit Fault

Fault Type:

Discrete Fault

*For autotest faults (only) the fault location given is for block A of the group if the fault affects all blocks in the group; otherwise, the location is that of the affected block.

Reporting of No-Load Faults on 4-Block Output Groups

The pairs of source and sink blocks in a four-block output group share loads. If outputs are off, a No-load will be reported in the normal manner if any block in the group has a no-load condition. However, if outputs are on and a No-load fault occurs on just one block of the pair, it does not appear in the fault table because the other block of the pair is still supporting the load. Therefore, an output No-load fault is reported only if both sink blocks in the group or both source blocks in the group report a No-load fault.

The fault location listed in the I/O Fault Table is that of the second block reporting the fault. For example:

0.3.1.1

1 %Q 00019

CIRCUIT FAULT DISCRETE FAULT 03±08 11:23:16

In this example, the location of the output block reporting the fault is rack 0, slot 3, bus 1, serial bus address 1. However, both of the (source or sink) blocks in that pair actually have No-load faults for output %Q00019.

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GeniustModular Redundancy Flexible Triple Modular Redundant (TMR) System

GFK-0787B

 

User's Manual ±March 1995

 

Page 76
Image 76
GE GFK-0787B user manual Fault Table Messages for GMR, Reporting of No-Load Faults on 4-Block Output Groups