Appendix 1.2 Setting Examples - Mitsubishi Electric Melsec Q Series User Manual

APPENDIX

Appendix 1.2 Setting examples

App - 4
This section explains the calculation example of arrival monitoring time setting value
and the processing time of the data link instruction when the calculated value is set to
the control data.
(1) Executing the READ instruction for one channel
(Communication request source station)
(a) Calculating arrival monitoring time
Apply the following values for sequence scan time of the CPU module on
the communication request source station (St) and response time of the
CPU module on the communication request destination station (Rt).
St = 20ms
Rt = 30ms × 1 scan = 30ms
Since the READ instruction is used, communication processing time
between the Ethernet modules on the communication request source
station and on the communication request destination station (Dt) will be
the following value.
Dt = 9.9ms
Set a value larger than the following to the arrival monitoring time.
St × 2 + Dt + Rt = 20 × 2 + 9.9 + 30 = 79.9ms
(b) Number of resends
Set 3 times.
(Communication request destination station)
READ instruction
1 channel used
MELSEC-Q/L
App - 4