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APPENDICES
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Appendix 5 Processing Time
Appendix 5.5 Safety refresh monitoring time
Appendix 5.5 Safety refresh monitoring time
Safety refresh monitoring time is the time monitored by the receiving station for each safety connection to detect the
following safety communication errors.
• Safety communication stop due to an error on the sending station
• Safety communication stop due to an error on the transmission path, such as cable disconnection or hub
failure.
Set safety refresh monitoring time to one of the safety stations (active side) that performs safety
communication.
*1
( Page 90, Section 7.6)
*1 The active side and the passive side use the same safety refresh monitoring time.
The time value must satisfy the following formula.
If time between a safety data reception and the next safety data reception on the receiving station exceeds the safety
refresh monitoring time, the receiving station detects an safety monitoring timeout error and stops safety
communication. The safety data to be received from the sending station is cleared at the time.
When the safety CPU module detects a safety monitoring timeout error, check if the safety refresh monitoring time satisfies
the formula above.
LS: Link scan time
:
• Number of safety connections on the active side Number of safety connections on the passive side:
Number of safety connections on the active side 8 (Round up the calculated value to the nearest integer.)
• Number of safety connections on the active side < Number of safety connections on the passive side:
Number of safety connections on the passive side 8 (Round up the calculated value to the nearest integer.)
Safety refresh monitoring time Transmission interval monitoring time (active side)
+ Transmission interval monitoring time (passive side)
+ LS ( + 1) [ms]