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MELSEC-Q
3 SPECIFICATIONS
(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
D2 = (ST + T + SR + R) 2 + (LS 4) + LSU [ms]
(MAX : T
D2 = (ST + T + S
R
+ R) 2 + (LS 6) + LSU)
2) SEND - RECV arrival time
T
D3 = ST + T + (LS 2) + (SR 2) + R + LSU [ms]
(MAX : T
D3 = ST + T (LS 3) + (SR 2) + R + LSU)
3) SEND - RECVS arrival time
T
D4 = ST + T + (LS 2) + SR + R + LSU [ms]
(MAX : T
D4 = ST + T + (LS 3) + SR + R + LSU)
ST : Send side scan time
SR : Receive side scan time
T : Send side link refresh time
2
R : Receive side link refresh time
2
LS : Link scan time
LSU= -1 (LS 2)
(Number of simultaneous transient requests)
(Maximum transient count)
1
Number of simultaneous transient requests : Total number of transient
requests made from stations
on the same network during
one link scan
Maximum transient count : Max. transient count during one link scan set by
supplementary settings of common parameters
1: Round up the fractional portion
2: Total number of mounted network modules