Mitsubishi Electric MELSEC QS Series User Manual page 55

4
FUNCTIONS
[Asynchronous mode]
Safety CPU module
(Sequence scan)
Safety master module
buffer memory
(Remote input RX/
remote output RY)
Link scan
Response time of first station
Response time of target station
Response time of last station
Safety remote
I/O station response
Input
a: Delay time due to a response delay of a safety remote I/O station
b: Delay time due to data transmission from the safety remote I/O station to the safety
master module
c: Delay time elapsed from when the safety master module receives the data until it stores
them to the buffer memory
d: Delay time elapsed until the data on the safety master module are refreshed to the
safety CPU module
e: Execution time of sequence processing and delay time in storage from the safety CPU
module to the buffer memory
f: Delay time due to data transmission from the safety master module to the safety remote
I/O station
g: Delay time due to internal processing of the safety remote I/O station
h: Delay time due to a response delay of the safety remote I/O station
[Setting method]
Data link is performed without synchronization with the sequence scan.
a c
b
Transmission delay time (reception)
For the specification of the scan mode, refer to CHAPTER 6.
4.2 Detailed Explanation of Functions
4.2.13 Scan synchronization function
e
d
Sequence
processing time
1
2
3
Output
g
f h
Transmission
delay time
(transmission)
4
5
6
7
8
4
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