APPX
Appendix 7 Processing Time
351
A
• Calculate the link scan time used for calculation of the safety refresh 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)
• The Safety CPU may detect a safety communication timeout if the safety communications are affected by
noise. If required, add an integral multiple of ((TMact 2) + (TMpas 2)) to the safety refresh monitoring
time.
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