6
The following table shows which IR words are allocated to the analog adjust-
ments on the CPM1A’s CPU Unit.
Control Corresponding IR word Setting range (BCD)
Analog adjustment 0 IR 250
0000 to 0200
Analog adjustment 1 IR 251
Input Filter Function 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
Input time constant
t
t
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 Word 000 Word 001 or later
1 ms 1 to 1.5 ms 0.1 to 0.3 ms
2 ms 2 to 2.5 ms 0.7 to 1.5 ms
4 ms 4 to 4.5 ms 1.5 to 2.5 ms
8 ms 8 to 8.5 ms 3 to 4.5 ms
16 ms 16 to 16.5 ms 6 to 9 ms
32 ms 32 to 32.5 ms 12 to 18 ms
64 ms 64 to 64.5 ms 24 to 35 ms
128 ms 128 to 128.5 ms 50 to 70 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
Input Interrupts The CPM1A-10CDR-(-V1)/10CDT-D(-V1)/10CDT1-D(-V1) PCs have 2 inter-
rupt input terminals and the CPM1A-20CDR-(-V1)/20CDT-
D(-V1)/20CDT1-D(-V1), CPM1A-30CDR-(-V1)/ 30CDT-D/30CDT1-D(-V1),
and CPM1A-40CDR-(-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, 2, 3... 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.
CPM1A Features and Functions Section 1-1
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