I/O Link Control - Panasonic FP3 Technical Manual

2. I/O Link Control

J Maximum I/O link transmission time (Tiol)
The maximum I/O link transmission time (Tiol) is the time it takes for an output signal from one master station (master
A or master B) to be transmitted to and received by another master station (master A or master B) as an input signal
during I/O link control.
Tiol is calculated by the following formula.
Tiol (ms) = Tc + 12
. . .
Tiol (ms) = Tc + 14 . . .
Tc = Scan time of the CPU
This is the time required for the FP3/FP10S CPU to perform an I/O update, program execution or tool services.
The value varies depending on the program and operating conditions.
The current, minimum and maximum values of the scan time are stored in special data registers:
-DT9022, DT9023, and DT9024 of the FP3 CPU
-DT90022, DT90023, and DT90024 of the FP10S CPU
Example:
FP3/FP10S
CPU
Master A
output
FP3
transmitter
master unit
FP3
transmitter
master unit
Master B
input
FP3/FP10S
CPU
master station combinations (FP3/FP10S and FP1, FP3/FP10S and FP-M)
master station combination (FP3/FP10S and FP3/FP10S)
I/O update
Tc
Tiol
I/O update
8-5. Transfer Time
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