Omron operation manual 3 CPM1A Functions, Control Corresponding IR word Setting range BCD

CPM1A Features and Functions Section 1-1

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

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
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

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