Mitsubishi Electric MELSEC-QS Series Safety Application Manual page 158

APPENDICES
LS:
n:
m:
DT1, DT2:
Safety refresh monitoring time:
Safety data monitoring time:
WDT (Watchdog timer):
Synchronous mode:
Asynchronous mode:
APPX
- 2 Appendix 1 Calculating Safety Response Time of CC-Link Safety
Link Scan Time of CC-Link Safety
LS/WDT (Round up the calculated value to the nearest integer.)
Safety refresh response processing time/(WDT
nearest integer.)
Safety refresh response processing time
User's manual for the safety remote I/O station used on CC-Link Safety
Response time of a sensor or output-target device. Check and add the response time of
the device used.
Time set in network parameter.
Use the value gained by the following calculation formula as measure.
In synchronous mode
(WDT n) 3 + ((WDT
: 0 when LS 1.5ms, 1 when LS
In asynchronous mode
(WDT n) 3 + LS + ((WDT
: 0 when LS 1.5ms, 1 when LS
Time set in network parameter for CC-Link Safety
Use the value gained by the following calculation formula as measure.
Safety refresh monitoring time
Time set in programmable controller parameter.
Calculate the SM (scan time) value referring to the following manual and set this timer
value equal to or more than the calculated value.
QSCPU User's Manual (Function Explanation, Program Fundamentals)
Mode which performs data link when sequence scan is synchronized with link scan.
In synchronous mode, sequence scan and link scan start simultaneously.
CC-Link Safety System Master Module User's Manual
Mode which performs data link without synchronizing sequence program
CC-Link Safety System Master Module User's Manual
n) (Round up the calculated value to the
n) m) 2 + (WDT
1.5ms
n) m) 2 + (WDT
1.5ms
2 - ((WDT n) m) - 10 [ms]
) [ms]
) [ms]