Mitsubishi Electric MELSEC-QS Series Safety Application Manual page 174

APPENDICES
Transmission interval monitoring time = WDT (1) of sending station + 2
Transmission time of CC-Link IE Field Network = (Safety refresh monitoring time of CC-Link IE Field Network
APPX
Appendix 2 Calculating Safety Response Time When CC-Link Safety and CC-Link IE Field Network are
- 18
Used
(c) Calculation example of transmission time of CC-Link IE Field Network
1) Link scan time (LS) of CC-Link IE Field Network
This time is required to calculate transmission time of CC-Link IE Field
Network. The following is the calculation example. (Condition: Only safety
communication is performed and no communication error station exists.) For
Ka to Ke, use values when the station is set to Normal mode.
= (((RX points + RY points)/8
LS
+ (RWr points + RWw points)
+ (Number of connected slave stations
+ (Number of interrupt conditions in the interrupt setting)
+ (Total of Ke values of each module)
= (0 + (1
+ (300 + 300)
= 1.6 [ms]
2) Transmission interval monitoring time of CC-Link IE Field Network
This time is required to calculate transmission time of CC-Link IE Field
Network. The following is the calculation example.
3) Safety refresh monitoring time of CC-Link IE Field Network
This time is required to calculate transmission time of CC-Link IE Field
Network. The following is the calculation example.
: Number of safety connections/8 = 1/8
Safety refresh monitoring time
4) Transmission time of CC-Link IE Field Network
The following is the calculation example of transmission time of CC-Link IE
Field Network.
2)
25.8) + 655 + (160 + 60
1000
10 + 2 = 12 [ms]
Transmission interval monitoring time (active side)
+ Transmission interval monitoring time (passive side)
+ LS ( + 1)
= 12 + 12 + 1.6
27.2 28 [ms]
=
- (Transmission interval monitoring time of CC IE master
- (Transmission interval monitoring time of CC IE local
+ (WDT(2) 3)
= (28
4) - (12 3) - (12
= 58 [ms] (Calculation result C)
0.08
Ka) + Kb + Kc + Kd)
0.02
1000
1) + 0) 1000 + (0 0.02)
1
(1 + 1)
4) + (10 3)
1000
4)
3)
4)