Mitsubishi Electric MELSEC iQ-R Series Safety Manual page 49

Sending interval monitoring time
Sending interval monitoring time is the time that the receiving station detects in each safety connection the following safety
communication errors.
• Delay in safety data sending cycle due to an error on the sending station
• Loss of safety data in the transmission path due to influence such as noises
To set transmission interval monitoring time between the master station and safety remote I/O module of the MELSEC iQ-R
series CC-Link IE Field Network master/local module, set the two poles of the safety station to perform safety communications
to the active side and passive side so that all calculation formulas in (1) to (6) below can be satisfied.
■MELSEC iQ-R series CC-Link IE Field Network master/local module
• If the communication destination is a master station (safety station) or local station (safety station):
(1) Transmission interval monitoring time [ms]  SCown  3
(2) Transmission interval monitoring time [ms]  SCoth  2 + LS  2
• If the communication destination is a safety remote I/O module:
(3) Transmission interval monitoring time [ms]  SCown  3
(4) Transmission interval monitoring time [ms]  SRref  2 + LS  2
■Safety remote I/O module
(5) Transmission interval monitoring time [ms]  SRref  2
(6) Transmission interval monitoring time [ms]  SCmst  2 + LS  2
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
For specific examples, refer to the following.
Page 234 Calculating Safety Response Time for System Configured with a Safety CPU, Page 242 Calculating Safety
Response Time for System Connected to Multiple Safety CPUs
For details, refer to the following.
 MELSEC iQ-R CPU Module User's Manual (Application)
 CC-Link IE Field Network Remote I/O Module (With Safety Functions) User's Manual
4 PRECAUTIONS FOR USE OF SAFETY PROGRAMMABLE CONTROLLER
4.2 Precautions for Programming
4
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