Design for safety – Flowserve MX Electronic Actuator SIL Safety IOM User Manual
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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