Mitsubishi Electric MELSEC QS Series User Manual page 54

4
FUNCTIONS
f: Delay time due to data transmission from the safety master module to a safety remote
g: Delay time due to internal processing of a safety remote I/O station
h: Delay time due to a response delay of a safety remote I/O station
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
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
c: Delay time elapsed from the time the safety master module receives the data until it
d: Delay time elapsed until the data on the safety master module are refreshed to the
e: Execution time of sequence processing
f: Delay time due to data saving from the safety CPU module to the buffer memory
g: Delay time due to data transmission from the safety master module to a safety remote
h: Delay time due to internal processing of a safety remote I/O station
i: Delay time due to a response delay of a safety remote I/O station
4
- 28 4.2 Detailed Explanation of Functions
4.2.13 Scan synchronization function
I/O station
(b) Sequence scan < Link scan
Input
a b
Transmission delay time (reception)
master module
stores them to the buffer memory
safety CPU module
I/O station
c d e
Sequence
processing time
Output
g
h
f i
Transmission delay time
(transmission)