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5
1-1-3 CPM1A Functions
Analog Setting Function CPM1A PCs have 2 variable-resistor adjustment knobs used to control analog
timer and counter settings manually. When one of the adjustments is turned, the
content of the corresponding IR word is set automatically between 0 and 200
(BCD).
Turn the adjustment knob with a Phillips screwdriver.
Analog adjustment 0
Analog adjustment 1
24 VDC 0.2 A
OUT PUT
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
CPM1A Features and Functions Section 1-1