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Mitsubishi Electric MELSEC-QS Series Safety Application Manual page 35

Safety programmable controller
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4
PRECAUTIONS FOR USE OF SAFETY
PROGRAMMABLE CONTROLLER
(c) When using CC-Link IE Field Network between safety programmable controllers
Input side A
Input side B
Input
C
Emergency stop switch
PFD
= (PFD of input side A) + (PFD of input side B) + (PFD of C) + (PFD of output side A)
+ (PFD of output side B) + (PFD of D)
-5
= (4.10
10
+ 8.75
-5
+ (2.57
10
) + (PFD of D)
-4
= (3.08
10
) + (PFD of C) + (PFD of D)
PFH
= (PFH of input side A) + (PFH of input side B) + (PFH of C) + (PFH of output side A)
+ (PFH of output side B) + (PFH of D)
-10
= (9.20
10
+ 3.85
-9
+ (1.15
10
) + (PFH of D)
-8
= (1.18
10
) + (PFH of C) + (PFH of D)
Output side B
Figure 4.3 Example when CC-Link IE Field Network are used
4.1 Precautions for Designing Safety Application
-5
-5
10
) + (2.57
10
) + (PFD of C) + (4.10
-9
-9
10
) + (1.15
10
) + (PFH of C) + (9.20
-5
-5
10
+ 8.75
10
)
-10
-9
10
+ 3.85
10
)
Output side A
Output
D
Safety relay
4
- 5
1
2
3
4
5
6

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