See the following diagram for the basic operation.
In the diagram, the current Fault Message is saved at Fault Situation #1. Each
fault message is saved based on the time of occurrence, from index 0 to 63.
The fault messages are written (overwritten) to the memory when every eighth
fault message in each Fault Situation is saved at index 7, 15, 23, 31, 39, 47,
55 and 63. When the PLC control word bit 7 is set to 1, a “Fault Ack” is
triggered, which in turn increases the Fault Situation number by 1 until it
becomes 7 (Fault Situation #7).
The saved Fault Messages match the drive trip information (latch type trip info-
1, latch type trip info-2, level type trip info, H/W Diagnosis Trip info) as defined
in the following table.
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