Mitsubishi Electric MELSEC-Q Series - Cyclic Transmission Delay Time

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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
(b) When a Redundant CPU receives transmission data
*1 For the scan time delay due to tracking transfer, refer to the following.
QnPRHCPU User's Manual (Redundant System)
Calculated value
Transmission delay time [ms] for ST > LS
Station-based block data assured Station-based block data not assured
Normal value TD1 = (ST + T) × 1.5 + LS × 0.5 + (SR + R) × 1.5 TD2 = (ST + T + LS × 0.5 + (SR + R) × 1.5
Maximum value TD1max = (ST + T) × 2 + LS × 1 + (SR + R) × 2 TD2max = ST + T + LS × 1 + (SR + R) × 2
Extended
mode
Normal value TD1 = (ST + T) × 1.5 + LS × 0.5 + (SR + R) × 2.5 TD2 = (ST + T + LS × 0.5 + (SR + R) × 1.5
Maximum value TD1max = (ST + T) × 2 + LS × 1 + (SR + R) × 3 TD2max = ST + T + LS × 1 + (SR + R) × 2
Calculated value
Transmission delay time [ms] for ST < LS
Station-based block data assured Station-based block data not assured
Normal value TD3 = (ST + T) + LS × 1 + (SR + R) × 1.5 TD4 = ST + T + LS × 0.5 + (SR + R) × 1.5
Maximum value TD3max = (ST + T) + LS × 2 + (SR + R) × 2 TD4max = ST + T + LS × 1 + (SR + R) × 2
Extended
mode
Normal value TD3 = (ST + T) + LS × 2 + (SR + R) × 2.5 TD4 = (ST + T + LS × 1 + (SR + R) × 1.5
Maximum value TD3max = (ST + T) + LS × 3 + (SR + R) × 3 TD4max = ST + T + LS × 2 + (SR + R) × 2
Calculated value
Transmission delay time [ms] for ST > LS
Station-based block data assured Station-based block data not assured
Normal value TD1 + Ts × 1.5 TD2 + Ts × 1.5
Maximum value TD1max + Ts × 2 TD2max + Ts × 2
Calculated value
Transmission delay time [ms] for ST < LS
Station-based block data assured Station-based block data not assured
Normal value TD3 + Ts × 1.5 TD4 + Ts × 1.5
Maximum value TD3max + Ts × 2 TD4max + Ts × 2
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
*1
LS: Link scan time