User`s manual

10
CPU MODULE PROCESSING TIME
10.1 Scan Time
10.1.2 Time required for each processing included in scan time
10 - 2
9
Device Explanation
10
CPU Module Processing
Time
11
Procedure for Writing
Program to CPU ModuleAppendicesIndex
(2) Calculation of scan time
The scan time is calculated from the following formula.
SM = Tru + Tio + Tie + Tend + Ts + Tc (ms)
SM :Scan time
•Tru :
Module refresh time
Tio :I/O refresh time
•Tie :Instruction execution time
Tend:Execution time for each function processed by the END
Ts :Service processing time
Tc :Common processing time
10.1.2 Time required for each processing included in scan time
This section explains how to calculate the processing and execution times shown in
Section 10.1.1.
(1) Module refresh time
The module refresh time is the total of the time for the auto refresh of the
MELSECNET/H and the CC-Link Safety set with the network parameters.
(a) Refresh of MELSECNET/H
This indicates the time taken to refresh data between the link devices of the
MELSECNET/H network and those of the CPU module.
The reffesh time (Tmnet) of MELSECNET/H is calculated
from the following
formula.
Tmnet = 1.85 (number of refresh wors) + 1000 ( s)
Refer to the following manual for the number of refresh wors.
Q Corresponding MELSECNET/H Network System Reference Manual
(PLC to PLC network)
(b) Auto refresh of CC-Link
This indicates the time taken to refresh data between the CC-Link Safety master
module and CPU module.
Refer to the following manual for the auto refresh time of CC-Link Safety.
CC-Link Safety System Master Module User's Manual
(2) I/O refresh time
The I/O refresh time is the refresh time for I/O data between the CC-Link Safety
master module and MELSECNET/H module.
I/O reffesh time (Tio) is calculated
from the following formula.
Tio = (number I/O points) 0.224 + 310 ( s)