Omron CPM1 Programming Manual

40
CQM1 Interrupt Functions Section 1-5
1-5-2 Input Interrupts
The CPU Unit’s inputs allocated IR 00000 to IR 00003 can be used for inter-
rupts from external sources. Input interrupts 0 through 3 correspond respec-
tively to these bits and are always used to call the subroutines numbered 000
through 003 respectively. When input interrupts are not used, subroutine num-
bers 000 to 003 can be used for ordinary subroutines.
Processing There are two modes for processing input interrupts. The first is the Input
Interrupt Mode, in which the interrupt is carried out in response to an external
input. The second is the Counter Mode, in which signals from an external
source are counted at high speed, and an interrupt is carried out once for
every certain number of signals.
In the Input Interrupt Mode, signals with a length of 100
µs or more can be
detected. In the Counter Mode, signals up to 1 kHz can be counted.
PC Setup Parameters Before executing the program, make the following settings in the PC Setup in
PROGRAM mode.
Interrupt Input Settings (DM 6628)
If these settings are not made, interrupts cannot be used in the program.
Input Refresh Word Settings (DM 6630 to DM 6633)
Make these settings when it is necessary to refresh inputs.
Example: If DM 6630 is set to 0100, IR 000 will be refreshed when a signal is
received for interrupt 0.
Note If input refreshing is not used, input signal status within the interrupt routine
will not be reliable. This includes even the status of the interrupt input bit that
activated the interrupt. For example, IR 00000 would not be ON in interrupt
routine for input interrupt 0 unless it was refreshed (in this case, the Always
ON Flag, SR 25313 could be used in place of IR 00000).
Input interrupt 3 setting
Input interrupt 2 setting
Input interrupt 1 setting
Input interrupt 0 setting
0: Normal input
1: Interrupt input
Default: All normal inputs.
15 0
DM6628
Bit
Number of words (2 digits BCD) 00 to 08
Beginning word (2 digits BCD) 00 to 07
Default: No input refresh
15 0
DM6630 to DM 6633
Bit
DM 6630: Interrupt 0
DM 6631: Interrupt 1
DM 6632: Interrupt 2
DM 6633: Interrupt 3

Omron CPM1 Specifications

General

Brand	Omron
Model	CPM1
Category	Controller
Language	English