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Appendix 5.4 Transmission interval monitoring time
Transmission interval monitoring time is the time monitored by the receiving station for each safety connection to
detect the following safety communication errors.
• Delay in transmission interval of safety data due to an error on the sending station
• Safety data loss on the transmission path due to noise
Set transmission interval monitoring time to both safety stations (active side and passive side) that perform safety
communication. ( Page 90, Section 7.6)
The time value must satisfy the following formula.
*1 Use the larger value.
If time between a safety data transmission and the next safety data transmission on the sending station exceeds the
transmission interval 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 transmission interval monitoring time
satisfies the formula above.
● If the difference between the transmission interval monitoring time of own station and that of the communication target
station is four times or more, change the transmission interval monitoring time so that the difference stays less than four
times.
Asynchronous mode Synchronous mode
SM: • To calculate transmission interval monitoring time on the active side: Sequence scan time of the active side (maximum
value)
• To calculate transmission interval monitoring time on the passive side: Sequence scan time of the passive side (maximum
value)
LS: Link scan time
:
Number of safety connections at the sending station 8 (Round up the calculated value to the nearest integer.)
SM of sending station + 2 [ms]
or
LS 2 + 2 [ms]
1
1
SM of sending station + 2 [ms]
or
LS + 2 [ms]
1
1