CPM1A Features and Functions | Section | |
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1-1-3 CPM1A Functions
Analog Setting Function CPM1A PCs have 2
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) |
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| Analog adjustment 0 | IR 250 | 0000 to 0200 |
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| Analog adjustment 1 | IR 251 |
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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. |
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Input from an input device such as a limit switch
Input bit status 
t
tInput time constant
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 |
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1 ms | 1 to 1.5 ms | 0.1 to 0.3 ms |
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2 ms | 2 to 2.5 ms | 0.7 to 1.5 ms |
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4 ms | 4 to 4.5 ms | 1.5 to 2.5 ms |
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8 ms | 8 to 8.5 ms | 3 to 4.5 ms |
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16 ms | 16 to 16.5 ms | 6 to 9 ms |
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32 ms | 32 to 32.5 ms | 12 to 18 ms |
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64 ms | 64 to 64.5 ms | 24 to 35 ms |
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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
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