Flowserve MX Electronic Actuator SIL Safety IOM - Manual (Page 15)

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Limitorque MX Electronic Actuator FCD LMENIM2350-01 – 9/13
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5.6 Fail No-Action (Stay Put) Operation
The system is designed so that any single-point failure in the microprocessor-controlled signal lines will automatically
halt or prevent motor motion. We refer to this philosophy as “Fail No-Action.”
While not explicitly considered SIF, this implicit feature would reduce the risk in any SIS that would require the actuator
to stay in place during an emergency.
5.7 Multiple ESD Functions for Basic PST
Up to two independent ESD signals may be applied, prioritized and configured for different actions for the ESD event
associated with each.
ESD Priority 1: Digital Input 0 (Terminal 30)
ESD Priority 2: Digital Input 2 (Terminal 35) Signal is ignored if ESD Priority 1 is asserted.