Safety Manual User Manual



Document: 553630
ICSTT-RM446K-EN-P Issue: 10_C
4-33
Careful consideration should be given to the affect on the process of
using the ‗custom shutdown value‘ or the 'hold last state' setting. The PFD &
PFH data has been calculated on the basis that the shutdown state is
configured to the OFF state. Therefore the OFF state shall be used for SIL2
and SIL3.
Reactions to faults in output modules
When an output module goes faulty the following status information is
reported:
 module presence
 module health and status
 channel health and status
 field faults
 an echo of the front panel indicators for each module
When any of the following internal conditions exist the output module will fail-
safe:
 internal software error detected by the FPGA
 power feed combiner over temperature detection