YOKOGAWA FA-M3V e-RT3 Plus, Hardware Manual

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A2-27
IM 34M06C11-01E
- Interrupt function
The interrupt function may be used from either a ladder or BASIC program.
Inputs 1-4 correspond to terminal numbers 1-4.
(1) Interrupt processing in a ladder program
When using the interrupt function as an interrupt input, make an “I/O interrupt
definition” using the INTP instruction.
You can perform I/O interrupt definitions for a maximum of 4 points per single
CPU module. When an interrupt input is presented from the F3XH04-3N, an
interrupt program that begins with an INTP instruction and ends with an IRET
instruction is executed.
The interrupt response time, which is the time required for the CPU module to
recognize an interrupt input from the F3XH04-3N and start executing the
interrupt program, is dependant on the CPU module model and has the
following approximate values.
F3SP21/25/35 : approximately 0.5ms

F3SP22/28/38 : approximately 120

s
F3SP53/58/59/66/67 : approximately 100

s
F3SP71/76 : approximately 100

s
Note
Do not perform "I/O Interrupt Definition" for the same F3XH04-3N input module from
multiple CPU modules. The CPU module cannot be correctly notified of an interrupt
from the F3XH04-3N input module.
Define the following interrupt period as a standard:
- Interrupt input . . . only one point defined per CPU 1ms and above
If the interrupt period is 1 to 2ms, ensure that the scan time is 2ms or longer. If the
scan time is less than 2ms, use the constant scan time feature.
- Interrupt input . . . 2 to 4 points defined per CPU 10ms and above
If the interrupt period is short, the interrupt program will be executed frequently,
affecting normal program execution. It may also cause delay in responding to
commands from programming tool or personal computer links.
(2) Interrupt processing in a BASIC program
Declare the acceptance of interrupts with an ON INT statement after declaring the
use of a module with an ASSIGN statement.
For more information, see Section C4.3, “Interrupts” , in the BASIC CPU Modules
and YM-BASIC/FA Programming Language (IM 34M06Q22-01E).