7
- 15
7.4 Dedicated Instruction Transmission Delay Time
7.4.1 Link Dedicated Instruction Transmission Delay Time
7
PROCESSING TIME
(c) Transmission delay time for the SREAD/SWRITE instruction
* 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 7.20 When receiving station is non-redundant system [ms]
Sending station
Receiving station (non-redundant system)
Non-redundant system
TD1 = {(ST + T) × 2 + LS × 11 + (SR + R)} × (m + 1)
Redundant system
TD1 + TsT × 2 × (m + 1)
Table 7.21 When receiving station is redundant system and transmission does not pass through tracking cable [ms]
Sending station
Receiving station (redundant system)
Redundant system (control system CPU)
Redundant system (standby system CPU)
Non-redundant system
TD2 = {(ST + T) × 2 + LS × 11 + (SR + R + TsR)}
× (m + 1)
TD3 = {(ST + T) × 2 + LS × 11 + TsR}
× (m + 1)
Redundant system
TD2 + TsT × 2 × (m + 1)
TD3 + TsT × 2 × (m + 1)
Table 7.22 When receiving station is redundant system and transmission passes through tracking cable [ms]
Sending station
Receiving station (redundant system)
Access to control system CPU through standby system
Access to standby system CPU through
control system
Non-redundant system
TD4 = {(ST + T) × 2 + LS × 11 + (SR + R + TsR) + 6}
× (m + 1)
TD5 = {(ST + T) × 2 + LS × 11 + TsR + 6}
× (m + 1)
Redundant system
TD4 + TsT × 2 × (m + 1)
TD5 + TsT × 2 × (m + 1)
TD1 to TD5: Transmission delay time for the SREAD/SWRITE instruction
ST: Sequence scan time on sending side (except link refresh time and scan time delay due to tracking
transfer)
SR: Sequence scan time on receiving side (except link refresh time and scan time delay due to
tracking transfer)
T: Link refresh time on sending side
*1
R: Link refresh time on receiving side
*1
m: Number of fragmented transmissions = (Read or write data length) / 960 (Rounded up to the
nearest integer)
TsT: Scan time delay due to tracking transfer on the sending side
*2
TsR: Scan time delay due to tracking transfer on the receiving side
*2
LS: Link scan time
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