Omron C200HE User Manual

INT(89) is used to control the interrupt signals received from the Interrupt Input
Unit, and also to control the scheduling of the scheduled interrupt. INT(89) pro-
vides such functions as masking of interrupts (so that they are recorded but ig-
nored) and clearing of interrupts.

Refer to 5-23-2 Interrupts for more details on interrupts.

The MACRO instruction allows a single subroutine (programming pattern) to re-
place several subroutines that have identical structure but different operands.
Since a number of similar program sections can be managed with just one sub-
routine, the number of program steps can be greatly reduced. Refer to 5-23-5
MACRO – MCRO(99) for more details on this instruction.

The C200HX/HG/HE PCs support both input interrupts and scheduled inter-
rupts. Interrupts stop execution of the program to run a subroutine in must be
executed immediately (input interrupts from an Interrupt Input Unit) or subrou-
tines that must be executed periodically (scheduled interrupts).

There are two interrupt modes. In normal mode the CPU Unit waits until the cur-
rent process is completed before stopping the main program. In high-speed
mode the CPU Unit interrupts the current process. The normal mode is the de-
fault mode in C200HX/HG/HE PCs, but high-speed mode can be selected in the
PC Setup.

The following setting is used for normal interrupt mode.

DM 6620

0

0

0

0

In normal interrupt mode, the following processing will be completed once
started even if an interrupt occurs The interrupt will be processed as soon as the
current process is completed.

•

Host Link servicing

•

Remote I/O servicing

•

Special I/O Unit servicing

•

Individual instruction execution

Use this mode whenever using C200H interrupt subroutines without modifica-
tion or whenever possible considering the response time required for interrupts.

Note The C200HX/HG/HE is set to normal interrupt mode by default.

The following setting is used for high-speed interrupt mode.

DM 6620

1  –

–

–

Interrupt mode
(1 = high-speed)

In high-speed interrupt mode, the following processing will be interrupted and
the interrupt subroutine executed as soon as an interrupt is generated.

•

Host Link servicing

•

Remote I/O servicing

•

Special I/O Unit servicing

•

Individual instruction execution

Use this mode whenever interrupt response time must be accurate to 1.0 ms.

Data will not necessarily be concurrent if the high-speed interrupt mode is used
because Host Link servicing, remote I/O servicing, Special I/O Unit servicing,
and individual instruction execution will not necessarily be completed when