ABB RobotWare 7.7, Applications Manual

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Troubleshooting safety digital base devices
Check group status signals
In the safety controller there are two group status signals, SDIS (DI_Status) and
SDOS (DO_Status). The status signals indicate if errors are detected:
Description Reported status
OK 1
ALARM 0
If a fault is detected, the status signal for the input/output channel will be set to 0
(ALARM). The signal will remain in status 0 for 1000 ms. This ensures that
intermittent faults that only exist for a few milliseconds are latched long enough
to be read by the controller.
Note
The reported output status for the dual output channel pair will go to ALARM if
the outputs for the two signals from the controller/originator differ from each
other, without any discrepancy delay.
The status will automatically be set to 1 (OK) when the following is true:
• the Safety Input Latch Error Time (1000 ms) has elapsed
• both inputs/outputs have been cleared
• the cause for the failure has been removed.
Check cables
If the status signal for the input/output channel is set to 0 (ALARM), perform the
following checks:
1 Make sure that the cables are connected properly at both ends.
2 If the problem persists, replace the cables.
Application manual - Scalable I/O 75
3HAC070208-001 Revision: F
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4 Software commissioning
4.5 Configuring safety digital base devices
Continued