Mitsubishi Electric MELSEC iQ-R Series User Manual page 729

■Other extended times ()
The following describes other extended times () in the CPU module of the control system.
 = 0.6 + 1[ms]
When an error occurs during a tracking transfer, the scan time may be extended (1). 1 is determined as follows.
Item
Disconnection, pulling out, inserting of the other tracking cable
Momentary power failure or power-off in the standby system
Hardware failure in the standby system
*1 Maximum extended time for the redundant function module
When using the constant scan, take one of the following measures.
• The setting time of the constant scan is set by adding the above extended time (1) when an error occurs.
( Page 85 Setting constant scan)
• When one of the above errors has occurred and a continuation error occurs due to the excess of constant
scan time, clear the error. ( Page 208 Error Clear)
■Waiting time for tracking data reception (Taw)
The following describes the waiting time for tracking data reception (Taw) in the CPU module of the standby system.
The waiting time for tracking data reception is determined by two types of period; (1) the period from when the control system
CPU module receives a receive completion notification until next time it receives the notification and (2) the period when the
standby system CPU module sends a receive completion notification until it starts receiving tracking data.
When (1)  (2): 0 [ms]
When (1) > (2): (1) - (2) [ms]
Ex.
When CTRL is a control system execution program and MAIN is a program executed in both systems (in configuration with
*2
the main base unit only )
END
processing
I/O
*1
refresh
Tca
Control system
CPU module
Data reception Data reception
completion completion
Standby system
CPU module
END processing
*1 If the constant scan is used, waiting time for the constant scan is generated.
*2 In a redundant system with redundant extension base unit, the processing order in the scan is different ( Page 81 In redundant
mode), but the operation is the same as in a configuration with the main base unit only.
• For the I/O refresh processing time for (1) and (2) and END processing time for others, refer to the following.
Page 710 END processing time
• If the values of each item for (1) and (2) vary, the waiting time for tracking data reception also varies.
(1)
Scan time of the control system CPU module
MAIN, CTRL Twr
Tracking data
Update Update
completion completion
Trc I/O MAIN
refresh
(2)
Time for 1
6 [ms]
16 to 56 [ms]
50 to Total size of tracking data [word]  26.7  10
END processing
Tst Tca
Data reception Data reception
completion completion
Taw
END processing
Scan time of the standby system CPU module
-6 *1
+ 10 [ms]
I/O
*1
refresh
Update Update
completion completion
Trc
APPX
Appendix 7 Processing Time
A
727