Monitoring Time For Safety Communications - Mitsubishi Electric MELSEC iQ-R Series User Manual

Monitoring time for safety communications

This section describes the monitoring time for the safety communications.
The monitoring time is set for each safety connection. If the time exceeds the monitoring time, a safety communication
timeout is detected and the safety communications are stopped.
Setting Item
station
Master Transmission Interval
station Monitoring Time
Safety Refresh Monitoring
*1
Time
Slave station Transmission Interval
Monitoring Time
*1 The safety refresh monitoring time uses a common value between the master station and slave stations.
Master station
Ò
Ó
(1) Safety data sent from the master station to a slave station
(2) Safety data sent from a slave station to the master station
 to : Transmission/receiving intervals of safety data
APPX
314
Appendix 7 Processing Time
Description
• A slave station monitors the transmission interval  that the master station sends
safety data.
• The master station sends data to the slave station at the start of the safety
communications.
• The safety data includes the information of the time at which the data was sent.
The slave station monitors the transmission interval by comparing the time
information with the previous time information.
The master station monitors the receiving interval  that safety data received from a
slave station.
• A slave station monitors the receiving interval  that safety data received from the
master station.
• The master station sends data to the slave station at the start of the safety
communications.
• The master station monitors the transmission interval  that a slave station sends
safety data.
• A slave station sends data to the master station at starting the safety
communications.
• The transmission time information with safety data received on the master station
is monitored as compared with the last value.
Slave station
Ô
Õ
(1)
(2)
Station using
setting time
Slave station
Master station
Slave station
Master station