■Calculation example of the transmission interval monitoring time of the CC-Link IE Field
Network
Transmission interval monitoring time is used for calculation of the CC-Link IE Field Network transmission time.
<Transmission interval monitoring time between MELSEC iQ-R series CC-Link IE Field Network master/local modules>
According to Page 243 Transmission interval monitoring time of the CC-Link IE Field Network, all calculation formulas in (1) to
(2) below must be satisfied. Set this in increments of 0.1ms.
(1) Transmission interval monitoring time SCown 3 = 3 3 = 9 9 [ms]
(2) Transmission interval monitoring time SCoth 2 + LS 2 = 3 2 = 0.85 2 = 7.7 [ms]
SCown: Safety cycle time of the master station
SCoth: Safety cycle time of the communication destination
LS: Link scan time
Therefore, set the transmission interval monitoring time of the CC-Link IE Field Network master/local module to 9ms.
<Transmission interval monitoring time between the master station of MELSEC iQ-R series CC-Link IE Field Network master/
local module and the safety remote I/O module>
According to Page 243 Transmission interval monitoring time of the CC-Link IE Field Network, all calculation formulas in (1) to
(4) below must be satisfied. Set this in increments of 0.1ms.
• CC-Link IE Field Network master/local module (Set the time in increments of 0.1ms.)
(1) Transmission interval monitoring time SCown 3 = 3 3 = 9 9 [ms]
(2) Transmission interval monitoring time SRref 2 + LS 2 = 2 2 + 0.78 2 = 5.56 5.6 [ms]
• Safety remote I/O module (Set the time in increments of 1ms.)
(3) Transmission interval monitoring time SRref 2 = 2 2 = 4 [ms]
(4) Transmission interval monitoring time SCmst 2 + LS 2 = 3 2 + 0.78 2 = 7.56 8 [ms]
SCown: Safety cycle time of the master station
SCoth: Safety cycle time of the communication destination
SCmst: Safety cycle time of the master station
SRref: Safety remote station refresh response processing time
LS: Link scan time
Therefore, set the transmission interval monitoring time of the CC-Link IE Field Network master/local module to 9ms. Set the
transmission interval monitoring time of the safety remote I/O module to 8ms.
Appendix 2 Calculating Safety Response Time for System Connected to Multiple Safety CPUs
A
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