Flowserve MX Electronic Actuator SIL Safety IOM - Manual (Page 11)

11
Limitorque MX Electronic Actuator FCD LMENIM2350-01 – 9/13
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4
Design for Safety
Figure 4.1 - Safety Block Diagram - Basic ESD and PST
Case A‐B‐C‐D Meaning Action
Monitor Relay
De‐energises?
1 0001 Invalid STOP Yes
2 0010 CLOSE No
3 0011 Invalid STOP Yes
4 0100 CLOSE No
5 0101 Invalid STOP Yes
6 0110 Invalid STOP Yes
7 0111 STOP No
8 1000 Invalid STOP Yes
9 1001 OPEN No
10 1010 Invalid STOP Yes
11 1011 Invalid STOP Yes
12 1100 OPEN No
13 1101 Invalid STOP Yes
14 1110 Invalid STOP Yes
15 1111 Invalid STOP Yes
Case A‐B‐C‐D Meaning Action
Monitor Relay
De‐energises?
1 0001 Invalid STOP Yes
2 0010 LOCAL Yes
3 0011 Invalid STOP Yes
4 0100 LOCAL Yes
5 0101 Invalid STOP Yes
6 0110 Invalid STOP Yes
7 0111 STOP Yes
8 1000 Invalid STOP Yes
9 1001 REMOTE No
10 1010 Invalid STOP Yes
11 1011 Invalid STOP Yes
12 1100 REMOTE No
13 1101 Invalid STOP Yes
14 1110 Invalid STOP Yes
15 1111 Invalid STOP Yes