Xinje XD Series User Manual

380
 Duty cycle of PWM output =n /65535×100%
 PWM use the unit of 0.1Hz, so when set S2 frequency, the set value is 10 times of the
actual frequency (10f). E.g.: to set the frequency as 72 KHz, and then set value in S2 is
720000.
 When X0 is ON, output PWM wave; When X0 is OFF, stop output. PMW output doesn’t
have pulse accumulation.
T0
t
Note: it needs to connect 1K ohm amplification resistor between output terminal and common
terminal when using PWM instruction.
Example
There is a LED drived by DC24V. It needs to control the brightness of the LED. In order to
decrease the power loss of wave collector, turn ON the switch at the moment it is OFF, then
turn it OFF. This process will cycle. Connet a transistor between the power supply and LED.
The pulse signal will input from the transistor base terminal. The current between base and
emitter is pulse. The LED input voltage is proportional to the duty ratio. The LED input
voltage will be changed by changing the duty ratio. There are many methods to change the
value. The normal way is pulse width modulation (PWM) which means only changing the ON
holding time but not changing the ON frequency.
This example applies the PWM technology to the LED brightness adjustment. The controller
can accpet 24V PWM control signal. The brightness range includes 25%, 50%, 75%, 100%.
The brightness is controlled by the PWM duty ratio.
Element explanation:
PLC
component
Explanation
Mark
X0
Start button, X0 is ON when pressed.
X1
Stop button, X1 is ON when pressed.
X2
25% brightness button, X2 is ON when
In the left graph:
T0=1/f
t/T0=n/65535
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Xinje XD Series Specifications

General

Input Voltage	24V DC
Storage Temperature	-20°C to 70°C
Protection Class	IP20
Type	PLC
Series	XD
Programming Language	Ladder Logic, Instruction List
Communication Interface	RS232, RS485
Power Supply	24V DC
Digital Inputs	Available (number varies by model)
Digital Outputs	Available (number varies by model)
Analog Inputs	Available (number varies by model)
Analog Outputs	Available (number varies by model)
Output Type	Relay, Transistor
Number of Inputs	Varies by model (see Digital Inputs and Analog Inputs)
Number of Outputs	Varies by model (see Digital Outputs and Analog Outputs)
Operating Temperature	0°C to 50°C
Humidity	5% to 95% (non-condensing)