Mitsubishi Electric Melsec-QS Series Safety Application Manual page 78

APPENDIX
App
Appendix.1 Calculation Method of Safety Response Time
- 5
POINT
POINT
If connecting the remote station to the station with the reserved station setting,
and then clear the setting, the valus of NI, NW, N, ni, and nw in the LS calculation
formula will change.
When the reserved station was changed, recalculate the LS and safety response
performance.
For the reserved station function, refer to the CC-Link Safety System Master
Module User's Manual.
(2) Calculation example of response time
The following shows calculation example of the response time when WDT setting
value: 10ms, link scan time (synchronous mode): 0.3ms, link scan time
(asynchronous mode): 1.4ms, safety remote station input response time: 12.2ms,
safety remote station output response time: 10.4ms, and safety refresh response
processing time: 9.6ms.
(a) Calculation example of safety refresh monitoring time
1) In synchronous mode
n : LS/WDT = 0.3/10
m : (Safety refresh reponse processing time/(WDT
: LS = 0.3
(WDT n)
= (10 1)
= 50 [ms]
2) In asynchronous mode
n : LS/WDT = 1.4/10
m : (Safety refresh reponse processing time/(WDT
: LS = 1.4
(WDT n)
= (10 1)
= 51.4 [ms]
(b) Safety data monitoring time
1) In synchronous mode
Safety refresh monitoring time
= 50 2 - (10
= 80 [ms]
2) In asynchronous mode
Safety refresh monitoring time
= 51.8 2 - (10
= 82.8 [ms]
1
1.5 ms 0
3 + ((WDT n) m)
3 + ((10 1) 1) 2 + (10
1
1.5 ms 1
3 + LS + ((WDT n)
3 + 1.4 + ((10 1) 1)
2 - ((WDT
1) 1 - 10
2 - ((WDT
1) 1 - 10
n)) = 9.6/(10
2 + (WDT ) [ms]
0)
n)) = 9.6/(10
m) 2 + (WDT ) [ms]
2 + (10 0)
n) m) - 10
n) m) - 10
1) 1
1) 1