Functional Safety 2014

706-707 / 973

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1. Interfaces with the input module connected to the field sensor
2. E.g. analogue input - HMI interface, signal conditioning, generates trip
output. May incorporate latch, override.
3. Logic – e.g. AND, OR, timers, voting
4. E.g. shutdown valve - HMI interface, may incorporate latch
5. Interfaces with the output module, translating a boolean 0 or 1 into
typically 0V or 24V outputs.
Basic software structure of a SIF
Neil Wakeling, August 2014