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APPX
Appendix 7 Processing Time
■
Master station (safety station)
Intelligent device station (safety station)
The following table lists the time between a safety device of the SIL2 Process CPU on the master station (safety station)
turning on or off and the output of the intelligent device station (safety station) turning on or off.
SCmst: Safety cycle time of the master station (safety station) (
MELSEC iQ-R CPU Module User's Manual (Application))
TMmst: Transmission interval monitoring time of the master station (safety station) (
Page 348 Transmission interval
monitoring time)
LS: Link scan time (
SRout: Output processing time of the intelligent device station (safety station) (
MELSEC iQ-R CC-Link IE Field Network
Remote Head Module User's Manual (Application))
Safety response time
The safety response time is the maximum value of the time between a safety input of the remote device station (safety station)
turning off and a safety output of the remote device station (safety station) turning off (including an error detection time).
For calculation method of the safety response time, refer to the following.
Mitsubishi Safety Programmable Controller MELSEC iQ-R Series Machinery Directive (2006/42/EC) Compliance
Transmission interval monitoring time
The value of transmission interval monitoring time set in the master/local module must satisfy all of the following conditions.
TM: Transmission interval monitoring time
SCown: Safety cycle time of the own station (
MELSEC iQ-R CPU Module User's Manual (Application))
SCoth: Safety cycle time of the communication destination (
MELSEC iQ-R CPU Module User's Manual (Application))
LS: Link scan time (
SRref: Safety remote station refresh response processing time of the communication destination (
Manual for the remote
device station used)
S2cyc: Control cycle time of the module set to the SIL2 mode Main of the communication destination (
Manual for the
module set to the SIL2 mode)
Calculation value
Formula
Normal value
SCmst+TMmst+LS+SRout
Maximum value
SCmst + TMmst + (LS
2) + SRout
Communication destination
Condition
Master station (safety station) or local station
(safety station)
• TM
SCown
3
• TM
SCoth
2 + LS
2
Remote device station (safety station)
• TM
SCown
3
• TM
SRref
2 +LS
2
Intelligent device station (safety station)
For line topology, star topology, or coexistence of star and line topologies
• TM
SCown
3
• TM
S2cyc
2+LS
2
For ring topology
• TM
SCown
3
• TM
24+S2cyc
2+LS
10
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