Absolute Encoder Interface Board; Precautions When Using Pulse Output Functions; Model - Omron CQM1H - PROGRAM Programming Manual

Absolute Encoder Interface Board

2-2-12 Precautions When Using Pulse Output Functions

Pulse Output Structure
Clock for generating pulses
2-3

Absolute Encoder Interface Board

2-3-1

Model

Note When PRV(62) is used to read a port's status, the most recent information will
be read regardless of the PC's cycle time.
The Pulse I/O Board divides the 500 kHz source clock by an integer value to
generate an output pulse frequency. For this reason, the frequency setting
and the frequency actually produced may differ. Refer to the following formula
to calculate the actual frequency.
Setting frequency:
Output frequency set by User.
Division ratio:
An integer value set at the division circuit to generate output pulses of the set
frequency.
Actual frequency:
Actual output pulse frequency produced by the division circuit.
Set division ratio (integer value) according
to frequency set by User.
500 kHz
Actual frequency (kHz) = 500 (kHz) / INT(500 (kHz) / Set frequency (kHz) )
INT: Function to derive integer value
INT (500 / Set frequency): Division ratio
The difference between the set frequency and the actual frequency increases
as the frequency increases, as shown in the examples in the following table.
Set frequency (kHz)
45.46 to 50.00
41.67 to 45.45
38.47 to 41.66
31.26 to 33.33
29.42 to 31.25
27.78 to 29.41
20.01 to 20.83
19.24 to 20.00
18.52 to 19.23
10.01 to 10.20
9.81 to 10.00
9.62 to 9.80
5.01 to 5.05
4.96 to 5.00
4.90 to 4.95
3.02 to 3.03
3.00 to 3.01
2.98 to 2.99
Name
Absolute Encoder
Interface Board
Output pulse (Actual frequency)
Division
circuit
Model
CQM1H-ABB21
Section 2-3
Actual frequency (kHz)
50.00
45.45
41.67
33.33
31.25
29.41
20.83
20.00
19.23
10.20
10.00
9.80
5.05
5.00
4.95
3.03
3.01
2.99
Specifications
2 inputs for absolute encoders
121