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AS-i Speed Monitor
Maintenance
7.
Maintenance
7.1
Controlling safe shutdowns
The plant safety engineer is responsible for verifying that the AS-i Speed Monitor
works correctly as part of the safety system.
At least once a year it is necessary to verify the safe shutdown by initiating asso-
ciated safety-related sensors or switchs:
Attention!
Press each safety-related AS-i slave and watch the reaction of the output circuits of the
AS-i Safety Monitor.
Attention!
Check the maximum activated time and the total operating time. These values depend
on the PFD value chosen for the total failure probability. Please refer to the information
in chap. <Safety relevant data>.
After reaching the projected maximum operating time (three, six, or twelve months) the
entire safety system must be checked for proper operation.
After reaching the projected total usage time (20 years) the device must be checked by
the manufacturer concerning its proper operation.
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