Cyclic Transmission Delay Time - Mitsubishi Electric MELSEC Q Series Reference Manual
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7.3
Cyclic Transmission Delay Time
7.3.1
Cyclic transmission delay time
The following shows calculation formulas for cyclic transmission delay time (the time until completion of data
transmission).
(1) In the case of a single network system
(a) When a non-Redundant CPU receives transmission data
Calculated value
Normal value
Maximum value
Normal value
Extended
mode
Maximum value
Calculated value
Normal value
Maximum value
Normal value
Extended
mode
Maximum value
(b) When a Redundant CPU receives transmission data
Calculated value
Normal value
Maximum value
Calculated value
Normal value
Maximum value
TD1 to TD4: Transmission delay time (Normal value)
TD1max to TD4max: Transmission delay time (Maximum value)
ST:
Sequence scan time on sending side (excluding link refresh time)
SR: Sequence scan time on receiving side (excluding link refresh time)
T:
Link refresh time on sending side (Total of the number of mounted network modules)
R:
Link refresh time on receiving side (Total of the number of mounted network modules)
Ts:
Scan time delay due to tracking transfer
LS:
Link scan time
*1
For the scan time delay due to tracking transfer, refer to the following.
QnPRHCPU User's Manual (Redundant System)
250
Transmission delay time [ms] for ST > LS
Station-based block data assured
TD1 = (ST + T) × 1.5 + LS × 0.5 + (SR + R) × 1.5
TD1max = (ST + T) × 2 + LS × 1 + (SR + R) × 2
TD1 = (ST + T) × 1.5 + LS × 0.5 + (SR + R) × 2.5
TD1max = (ST + T) × 2 + LS × 1 + (SR + R) × 3
Transmission delay time [ms] for ST < LS
Station-based block data assured
TD3 = (ST + T) + LS × 1 + (SR + R) × 1.5
TD3max = (ST + T) + LS × 2 + (SR + R) × 2
TD3 = (ST + T) + LS × 2 + (SR + R) × 2.5
TD3max = (ST + T) + LS × 3 + (SR + R) × 3
Transmission delay time [ms] for ST > LS
Station-based block data assured
TD1 + Ts × 1.5
TD1max + Ts × 2
Transmission delay time [ms] for ST < LS
Station-based block data assured
TD3 + Ts × 1.5
TD3max + Ts × 2
Station-based block data not assured
TD2 = (ST + T + LS × 0.5 + (SR + R) × 1.5
TD2max = ST + T + LS × 1 + (SR + R) × 2
TD2 = (ST + T + LS × 0.5 + (SR + R) × 1.5
TD2max = ST + T + LS × 1 + (SR + R) × 2
Station-based block data not assured
TD4 = ST + T + LS × 0.5 + (SR + R) × 1.5
TD4max = ST + T + LS × 1 + (SR + R) × 2
TD4 = (ST + T + LS × 1 + (SR + R) × 1.5
TD4max = ST + T + LS × 2 + (SR + R) × 2
Station-based block data not assured
TD2 + Ts × 1.5
TD2max + Ts × 2
Station-based block data not assured
TD4 + Ts × 1.5
TD4max + Ts × 2
*1
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