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7.4 Dedicated Instruction Transmission Delay Time
7.4.1 Link dedicated instruction transmission delay time
The following shows the calculation formulas for the link dedicated instruction transmission delay time (the time taken
from issuing an instruction until receiving a response).
(1) For a single network system
(a) Transmission delay time for the SEND/RECV/RECVS/ZNRD/ANWR instruction
*1 For the scan time delay due to tracking transfer, refer to the following.
QnPRHCPU User's Manual (Redundant System)
Sending station Transmission delay time of when the receiving station is a non-redundant system [ms]
Non-redundant system TD1 = (ST + T) × 2 + LS × 11 + (SR + R)
Redundant system TD1 + TsT × 2
Sending station
Transmission delay time of when the receiving station is a redundant system
(control system CPU) [ms]
Non-redundant system TD2 = (ST + T) × 2 + LS × 11 + (SR + R + TsR)
Redundant system TD2 + TsT × 2
TD1, TD2: Transmission delay time for the SEND/RECV/RECVS/ZNRD/ZNWR 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 (Total of the number of mounted network modules)
R: Link refresh time on receiving side (Total of the number of mounted network modules)
TsT: Scan time delay due to tracking transfer on the sending side
*1
TsR: Scan time delay due to tracking transfer on the receiving side
*1
LS: Link scan time
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