Mitsubishi Electric Melsec-QS Series Safety Application Manual page 75

APPENDIX
LS:
n:
m:
DT1, DT2:
Safety refresh monitoring time:
Safety data monitoring time:
WDT (Watchdog timer):
Synchronous mode:
Asynchronous mode:
Link Scan Time ( This Item (1) (a))
Value after the decimal point of (LS/WDT) is rounded up
Value after the decimal point of (Safety refresh response processing time/(WDT n)) is
rounded up
Safety refresh response processing time: Refer to User's Manual for the safety remote
station.
Response time of sensor or output destination controlling device. Check and add the
response time of the device to be 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
In asynchronous mode
(WDT n) 3 + LS + ((WDT
: 0 when LS 1.5ms, 1 when LS
Time set in network parameter
Use the value gained by the following calculation formula as measure.
Safety refresh monitoring time
Time set in PLC parameter.
Calculate SM (Scan time) with referring to the QSCPU User's Manual (Function
Explanation, Program Fundamentals), and set the watchdog timer value more equal to or
more than the gained value.
Mode which performs data link when sequence scan is synchronized with link scan.
In the 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
Appendix.1 Calculation Method of Safety Response Time
n) m 2 + (WDT ) [ms]
1.5ms
n) m 2 + (WDT
1.5ms
2 - ((WDT n) m) - 10 [ms]
) [ms]
App
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