Variable Duty Factor Pulse Outputs - Omron CQM1H - PROGRAM Programming Manual

Pulse I/O Board

2-2-10 Variable Duty Factor Pulse Outputs

Outline
Variable Duty Factor Pulse Outputs Using PWM(––)
Determine pulse output port.
Wire outputs.
PC Setup
(DM 6611/DM 6643/DM 6644)
Ladder Program
The following diagram shows the frequency of pulse outputs from port 1 as
the program is executed.
Frequency
20 kHz
5 kHz
The following is the procedure for outputting pulses with varying duty factors
(i.e., the ratio of the pulse ON time and the pulse cycle) from ports 1 and/or 2.
This function can be used for various kinds of control outputs, such as light
intensity output or speed control output to an inverter.
Variable duty factor pulse outputs from ports 1 and/or 2 are executed as
shown in the diagram below. Ports 1 and 2 can be used at the same time.
CPU Unit
Port 1 or port 2.
Output:
PWM(−−) with/without 1.6 kΩ resistance.
Power supply for output: 5/24 V DC
Port Mode Setting (DM 6611):
High-speed Counter Mode (0000 Hex) or Simple Positioning Mode (0001 Hex)
Operation settings for ports 1 and 2 (DM 6643/DM 6644):
Set to variable duty factor (1000 Hex).
PULSE WITH VARIABLE DUTY FACTOR, PWM(−−):
Set frequency and duty factor.
MODE CONTROL, INI(61):
Stop pulse output to a specified port.
HIGH-SPEED COUNTER PV READ, PRV(62):
Read pulse output status of a specified port.
About 1 kHz/4 ms
IR 00000
turns ON
Duty factor =  = 1% to 99%
Port 1
Port 2
Section 2-2
Time
Frequency = 91.6 Hz,
1.5 kHz,
5.9 kHz
t
on
T
t
on
T
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