Omron CPM1A Operation Manual page 30

CPM1A Features and Functions
Input Filter Function
Input Interrupts
1, 2, 3...
6
The following table shows which IR words are allocated to the analog adjust-
ments on the CPM1A's CPU Unit.
Control
Analog adjustment 0
Analog adjustment 1
The input time constant for the CPM1A's external inputs can be set to 1, 2, 4, 8,
16, 32, 64, or 128 ms. Increasing the input time constant can reduce the effects
of chatter or noise in the input signal.
Input from an input device
such as a limit switch
Input bit status
With the CPM1A, actual response time for each set input time constant for word
000 is different from that for word 001 or later.
Set value
1 ms
2 ms
4 ms
8 ms
16 ms
32 ms
64 ms
128 ms
The input response time of the CPM1A is obtained with the following:
2 ms max. (hardware performance) + input time constant (see above table)
+ cycle time
The CPM1A-10CDR-j(-V1)/10CDT-D(-V1)/10CDT1-D(-V1) PCs have 2 inter-
rupt input terminals
D(-V1)/20CDT1-D(-V1), CPM1A-30CDR-j(-V1)/ 30CDT-D/30CDT1-D(-V1),
and CPM1A-40CDR-j(-V1)/40CDT-D(-V1)/40CDT1-D(-V1) PCs have 4 inter-
rupt input terminals. There are two modes for input interrupts: input interrupt
mode and counter mode.
1. When an interrupt occurs in Input Interrupt Mode, the main program is inter-
rupted and the interrupt program is executed immediately, regardless of the
cycle time.
2. In Counter Mode, external input signals are counted at high speed (up to
1 kHz) and an interrupt is generated each time the count reaches the set
value. When an interrupt occurs, the main program is interrupted and the
interrupt program is executed. The set value can be set from 0 to 65,535.
Corresponding IR word
IR 250
IR 251
t
Word 000
1 to 1.5 ms
2 to 2.5 ms
4 to 4.5 ms
8 to 8.5 ms
16 to 16.5 ms
32 to 32.5 ms
64 to 64.5 ms
128 to 128.5 ms
and the CPM1A-20CDR-j(-V1)/20CDT-
Section 1-1
Setting range (BCD)
0000 to 0200
t
Input time constant
Word 001 or later
0.1 to 0.3 ms
0.7 to 1.5 ms
1.5 to 2.5 ms
3 to 4.5 ms
6 to 9 ms
12 to 18 ms
24 to 35 ms
50 to 70 ms