Mitsubishi Electric MELSEC-QS Series Safety Application Manual page 167

APPENDICES
(b) Calculating output transmission time of CC-Link Safety
Output transmission time of CC-Link Safety
POINT
The following is the formula to calculate output transmission time [ms] of CC-Link
Safety.
= (Safety refresh monitoring time of CC master (2)
+ Output response time of CC remote (2)
- (((WDT (2)
WDT (2) : A watchdog timer value for the safety CPU module (2). A value is set in PLC
parameter.
CCLS (2) : Link scan time of CC-Link Safety in the safety CPU module (2)
n : CCLS (2)/WDT (2) (Round up the calculated value to the nearest integer.)
m : Safety refresh response processing time/(WDT (2)
calculated value to the nearest integer.)
1) Safety refresh monitoring time of CC-Link Safety
This time is required to calculate output transmission time of CC-Link Safety.
For the calculation method, refer to Appendix 1 (1).
2) Link scan time of CC-Link Safety (CCLS (2))
This time is required to calculate output transmission time of CC-Link Safety.
For the calculation method, refer to Appendix 1 (1) (a).
The maximum value of safety response time is explained in this manual. For this
reason, WDT, the maximum value of SM (scan time), is used in calculation
formulas, instead of SM.
Use SM when calculating a normal value.
Appendix 2 Calculating Safety Response Time When CC-Link Safety and
CC-Link IE Field Network are Used
n) m) 2 + (WDT (2) n) + WDT (2)) [ms]
2)
n) (Round up the
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