Mitsubishi Electric Melsec-QS Series Safety Application Manual page 29

4
PRECAUTIONS FOR USE OF SAFETY PLC
Module/unit
PFD/PFH of safety CPU module, safety power supply module, safety main base
unit, and CC-Link Safety master module
PFD/PFH of safety remote I/O module
PFD/PFH of the safety PLC is listed in Table4.2.
Table4.2 PFD/PFH of safety PLC
*2
QS0J65BTB2-12DT (DC input
transistor output combined module)
QS0J65BTS2-8D (DC input module)
QS0J65BTS2-4T (transistor output
module)
*2: The number of the safety master modules is not relevant to the values of PFD or PFH.
(a) When using one QS0J65BTB2-12D
PFD = (PFD of A) + (PFD of B) + (PFD of C) + (PFD of D)
= (1.39 10 ) + (2.57
-4
= 1.65 10 + (PFD of C) + (PFD of D)
-4
PFH = (PFD of A) + (PFD of B) + (PFD of C) + (PFD of D)
= (4.95 10 -9 ) + (1.15
= 6.10 10 -9 + (PFH of C) + (PFH of D)
Input
Emergency stop switch
Figure4.1 Example when using one QS0J65BTB2-12DT
1.39
2.57
1.68
1.68
10 ) + (PFD of C) + (PFD of D)
-5
10 -9 ) + (PFH of C) + (PFH of D)
Output
Safety relay
4.1 Precautions for Designing Safety Application
PFD PFH (/h)
10 -4 4.95 10 -9
10 -5 1.15 10 -9
10 7.46 10
-5 -9
10 -5 7.46 10 -9
4
1
2
3
4
5
- 2