Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 90

3 SPECIFICATIONS
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S : Scan time of the sending station (except link refresh time)
T
S : Scan time of the receiving station
R

: Link refresh time of the sending station
T

: Link refresh time of the receiving station
R
LS : Link scan time
Ts : Scan time delay due to tracking transfer on the sending side 4
T
Ts : Scan time delay due to tracking transfer on the receiving side 4
R
(Number of simultaneous transient requests)
LS
U
(Maximum number of transient times)
Number of simultaneous transient requests:
The total number of times transient requests that are made during one link
scan from a station on the same network.
Maximum number of transients:
The maximum number of transients within one link scan set in the
supplementary settings of the common parameters.
1: For the redundant system, it is a scan time of the control system CPU.
2: Total time for the installed network modules.
3: The fraction is rounded up to the nearest whole number.
4: For the scan time delay due to tracking transfer, refer to the
QnPRHCPU User's Manual (Redundant System).
REMARKS
When executing transient transmissions from multiple stations at the same time, the
execution time of the instruction may be shortened by increasing the setting value
for the maximum number of transient requests in one link scan.
For instance, when 7 stations are supposed to execute an instruction, the time for
"LS 4" may be shortened by changing the setting value of the maximum transient
requests from the default value of 2 to 7 or larger in the transient setting in
supplementary settings of Common parameters from GX Developer.
Note, however, that the scan time of the CPU module increases by that time amount.
MELSEC-Q
1 (except link refresh time)
2
2
3
(LS
– 1
2)
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