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5-16 Genius Modular Redundancy Flexible Triple Modular Redundant (TMR) System
User’s Manual –March 1995
GFK-0787B
I/O Fault Table Messages for GMR
I/O Fault Table format is detailed in the Series 90-70 PLC Reference Manual (GFK-0265).
Fault Specific Data
Fault Category
Fault Action
Fault Group
Point
Block
I/O Bus
Slot
Rack
Reference Address
Long/Short
02 1F0100 00030101FF7F 0302 02 00 00 84000000000003
Fault Description
Fault Type
In the I/O Fault Table, the following additional types of messages are available for GMR:
Autotest fault messages
Discrepancy 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.