4
1-1-3 CPM1 Functions
Analog Setting Function CPM1 PCs have 2 analog volume controls that can be used to make analog
timer and counter settings manually. When one of the volume controls is turned,
the content of the corresponding IR word is set automatically between 0 and 200
(BCD).
Adjust the volume control with a Phillips-head screwdriver.
Analog volume control 0
Analog volume control 1
The following table shows which IR words are allocated to the analog controls on
the CPM1’s CPU Unit.
Control Corresponding IR word Setting range (BCD)
Analog volume control 0 IR 250
0000 to 0200
Analog volume control 1 IR 251
Input Filter Function The input time constant for the CPM1’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 CPM1, 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 CPM1 is obtained with the following:
2 ms max. (hardware performance) + input time constant (see above table)
+ cycle time
CPM1 Features and Functions Section 1-1
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