7
PROCESSING TIME
7.3 Cyclic Transmission Delay Time
7.3.1 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 Total for the number of mounted network modules.
* 2 For the scan time delay due to tracking transfer, refer to the following manual.
QnPRHCPU User's Manual (Redundant System)
Table 7.7 Transmission delay time for ST > LS
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
Table 7.8 Transmission delay time for ST < LS
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
Table 7.9 Transmission delay time for ST > LS
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
Ts × 2
Ts × 2
Table 7.10 Transmission delay time for ST < LS
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
Ts × 2
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
*1
R: Link refresh time on receiving side
*1
Ts: Scan time delay due to tracking transfer
*2
LS: Link scan time
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