Mitsubishi Electric MELSEC iQ-R Series User Manual page 299

Ex.
Calculation example of b when the transmission interval monitoring time (TMact) is 24 ms and the safety remote station
refresh response processing time is 2 ms.
24  2 = 12
The value is the multiple of safety remote station refresh response processing time (2 ms) so the safety refresh monitoring
time is 12.
• Calculate the communication cycle interval used in the calculation of the safety refresh monitoring time in
accordance with the conditions of the system used.
• 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.
• When "Communication Period Setting" of the communication destination sets to the setting other than
"Basic Period" in "Network Configuration Settings" under "Basic Settings" of the master station, multiply the
multiplication specified in "Multiple Period Setting" under "Communication Period Setting" of "Basic
Settings" by LS (Communication cycle intervals) as settings.
Setting example of monitoring time
The following shows a setting example of the transmission interval monitoring time and safety refresh monitoring time at each
communication cycle interval when the safety cycle time of the master station is 10 ms and the safety remote station refresh
response processing time of the safety remote I/O module is 2.3 ms.
Condition
Master station Safety remote
safety cycle time station refresh
response
processing time of
device station
(safety remote I/O
module)
10 ms 2.3 ms
*1 The actual cycle interval of the communication with the target device station. It indicates the value obtained by multiplying
"Communication Period Interval Setting" by a multiple of "Multiple Period Setting".
When "Communication Period Interval Setting" is set to 2 ms and the communication with the target device station is performed at
medium speed (four times)
Actual communication cycle interval [ms] = 2 × 4 = 8 ms
*2 For calculation method of the monitoring time to be set for the master station, refer to the following.
Transmission interval monitoring time: Page 296 Transmission interval monitoring time
Safety refresh monitoring time: Page 296 Safety refresh monitoring time
*3 For calculation method of the transmission interval monitoring time to be set for the safety remote I/O module, refer to the following.
CC-Link IE TSN Remote I/O Module (With Safety Functions) User's Manual
• The setting values in the above list are guides. Set a value greater than or equal to the calculated value.
• The larger the set value is, the less likely it is that a safety communication timeout due to noise will occur.
Master station setting value
Actual Transmission
communication interval monitoring
*1 *2
cycle interval time
4 ms 35 ms
8 ms 50 ms
16 ms 60 ms
32 ms 100 ms
Device station
setting value
Safety refresh Transmission
*2
monitoring time interval monitoring
*3
time
60 ms 35 ms
80 ms 50 ms
100 ms 60 ms
300 ms 100 ms
Appendix 6 Processing Time
A
APPX
297