Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual page 351

• Calculate the link scan time used for calculation of the transmission interval monitoring time in accordance
with the conditions of the system used. If disconnection and return of stations are not considered in a
system using the Safety CPU, transmission interval monitoring time can be shortened by setting Kd
(maximum data link processing time when the station is disconnected from or returned to the network) to 0.
However, the Safety CPU may detect a safety communication timeout if the station is disconnected or
returned. If the Safety CPU detects a safety communication timeout, change the transmission interval
monitoring time to a greater value.
• Calculate the link scan time used for calculation of the transmission interval monitoring time in accordance
with the conditions of the system used. For a system using the SIL2 Process CPU, set Kd (maximum data
link processing time when the station is disconnected from or returned to the network), assuming that the
station is disconnected or returned. If more number of stations than expected are disconnected or returned,
the SIL2 Process CPU may detect a safety communication timeout. For the formula to calculate the link
scan time, refer to the section explaining the link scan time in this manual. (Page 341 Link scan time
• If the Safety CPU or the SIL2 Process CPU detects a safety communication timeout, check that the
transmission interval monitoring time satisfies the above formula.
• When the transmission interval monitoring time has changed, the safety refresh monitoring time must also
be changed to meet the conditions specified for the safety refresh monitoring time. ( Page 350 Safety
refresh monitoring time)
APPX
Appendix 7 Processing Time
A
349