117
Pulse I/O Board Section 2-2
The following diagram shows the frequency of pulse outputs from port 1 as
the program is executed.
2-2-10 Variable Duty Factor Pulse Outputs
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.
Outline 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.
Variable Duty Factor Pulse Outputs Using PWM(––)
Frequency
Time
20 kHz
5 kHz
About 1 kHz/4 ms
IR 00000
turns ON
T
t
on
CPU Unit
Port 1
Port 2
Frequency = 91.6 Hz,
1.5 kHz,
5.9 kHz
Duty factor = = 1% to 99%
t
on
T
Determine pulse output port.
Wire outputs.
PC Setup
(DM 6611/DM 6643/DM 6644)
Ladder Program
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.
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