Mitsubishi Electric MELSEC Q Series Reference Manual page 109

3 SPECIFICATIONS
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(b) SEND/RECV/RECVS/READ/WRITE/REQ/ZNRD/ZNWR instruction
communication
The transmission delay time of instruction communication is the sum of the
following:
• Scan times of a multiplexed remote master station and a multiplexed
remote sub-master station (Except for the link refreshing time)
• Link refresh times of a multiplexed remote master station and a
multiplexed remote sub-master station
• Link scan time of a multiplexed remote master station
Calculate the sum as below:
[Transmission delay times of instruction communication]
1) SEND (with arrival check)/READ/WRITE/REQ/ZNRD/ZNWR instruction
+ 
T = (S + S
D2 T T R
+ 
(MAX : T = (S
D2 T
2) SEND - RECV arrival time
+ 
T = S + (LS
D3 T T
+ 
(MAX : T = S
D3 T
3) SEND - RECVS arrival time
+ 
T = S + (LS
D4 T T
+ 
(MAX : T = S
D4 T
ST : Send side scan time
SR : Receive side scan time
T
: Send side link refresh time
R
: Receive side link refresh time
LS : Link scan time
(Number of simultaneous transient requests)
LS =
U
Number of simultaneous transient requests : Total number of transient
Maximum transient count : Max. transient count during one link scan set by
1: Round up the fractional portion
2: Total number of mounted network modules
+ 
) 2 + (LS 4) + LS
R
+ 
+ S ) 2 + (LS
T R
R
2) + 
2) + (S
R
2) + 
(LS 3) + (S
T R
+ 
2) + S + LS
R R
+ 
+ (LS 3) + S
T R
(Maximum transient count)
supplementary settings of common parameters
MELSEC-Q
[ms]
U
6) + LS )
U
+ LS [ms]
R U
+ LS )
R U
[ms]
U
+ LS )
R U
2
2
1
-1 (LS 2)
requests made from stations
on the same network during
one link scan
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