Mitsubishi Electric MELSEC-QS Series Safety Application Manual page 166

APPENDICES
(1) Calculation method
(a) Input device response time
(b) Safety data transmission time (maximum value)
(c) Output device response time
Total
DT1, DT2
Input transmission time of CC-Link Safety
Transmission time of CC-Link IE Field Network
Output transmission time of CC-Link Safety
Input transmission time of CC-Link Safety = (Safety refresh monitoring time of CC master (1)
APPX
Appendix 2 Calculating Safety Response Time When CC-Link Safety and CC-Link IE Field Network are
- 10
Used
The maximum value of safety response time will be the sum of (a) to (c) in Table
APPX.2 For normal values, refer to the following.
• Transmission time of CC-Link Safety
CC-Link Safety System Master Module User's Manual
• Transmission time of CC-Link IE Field Network
MELSEC-QS CC-Link IE Field Network Master/Local Module User's
Manual
Table APPX.2 Calculation of safety response time (maximum value)
Item
(a) Calculating input transmission time of CC-Link Safety
The following is the formula to calculate input transmission time [ms] of CC-Link
Safety.
WDT (1) : A watchdog timer for the safety CPU module (1). A value is set in PLC
parameter.
CCLS (1) : Link scan time of CC-Link Safety in the safety CPU module (1)
n : CCLS (1)/WDT (1) (Round up the calculated value to the nearest integer.)
m : Safety refresh response processing time/(WDT (1)
calculated value to the nearest integer.)
1) Safety refresh monitoring time of CC-Link Safety
This time is required to calculate input transmission time of CC-Link Safety.
For the calculation method, refer to Appendix 1 (1).
2) Link scan time of CC-Link Safety (CCLS (1))
This time is required to calculate input transmission time of CC-Link Safety.
For the calculation method, refer to Appendix 1 (1) (a).
POINT
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.
Input transmission time of CC-Link Safety
+ Transmission time of CC-Link IE Field Network
+ Output transmission time of CC-Link Safety
DT1 + DT2 + Safety data transmission time (maximum value)
: Response time of a sensor or output-target device. Check and add
the response time of the device used.
: Refer to Appendix 2 (1) (a).
: Refer to Appendix 2 (1) (c).
: Refer to Appendix 2 (1) (b).
+ Input response time of CC remote (1)
- (((WDT (1) n) m)
Maximum value
DT1
DT2
2 + (WDT (1) n) + WDT (1)) [ms]
n) (Round up the
2)