Appendix 2 Calculating Safety Response Time For System Connected To Multiple Safety Cpus - Mitsubishi Electric MELSEC iQ-R Series Safety Manual

Appendix 2
This section describes the maximum value of safety response time for a system connected to multiple Safety CPUs using the
CC-Link IE Field Network. As described as a line topology, however, calculation is possible by methods described here
regardless of the connection methods such as line topology, star topology, or ring topology. For normal values, refer to the
following.
 MELSEC iQ-R CC-Link IE Field Network User's Manual (Application)
Safety remote I/O station (1)
Input device
response time
(1) CC-Link IE Field Network
Safety input
The maximum value of safety response time will be the sum of (a) to (c) of the following.
Item
(a) Input device response time
(b) Safety data transmission time (maximum value)
(c) Output device response time
Total
Explanations of symbols used for this chapter
• LS (1): CC-Link IE Field Network link scan time of Network Number 1
• LS (2): CC-Link IE Field Network link scan time of Network Number 2
• LS (3): CC-Link IE Field Network link scan time of Network Number 3
• DT1, DT2: Response time of a sensor or output-target control device. Check and add the following response time of the
device used.
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Appendix 2 Calculating Safety Response Time for System Connected to Multiple Safety CPUs

Calculating Safety Response Time for
System Connected to Multiple Safety
CPUs
Safety CPU (1) Master station
Network No.2
input transmission time
Master station Safety CPU (2) Local station
Network No.1
Safety data transmission time
(2) CC-Link IE Field Network
transmission time
Safety response time
Maximum value
DT1
Transmission time of CC-Link IE Field Network from safety input to safety
output
DT2
DT1 + DT2 + Safety data transmission time (maximum value)
Master station
Safety remote I/O station (2)
Network No.3
Output device
response time
(3) CC-Link IE Field Network
output transmission time
Safety output