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How to add a PWM to 0-5/10 V converter to a ACE PLC?

 

It is sometimes useful to be able to connect the ACE PLC or any other device to a PWM to 0-10 V converter.

What we can do with analog output…

  • Speed drive control – Regulating a motor via an analog input.
  • Converter – Convert and scale another analogue value to a 0-10 V value (via an ACE PLC)
  • LED lighting control – Adjusting brightness using a 0-10 V signal.
  • Proportional valve control – Fine management of fluid flow.
  • Servo motor control – Converting PWM signal to analog voltage.
  • Heating regulation – Controlling power via an analog input.
  • Industrial automation – Interface between PLC with PWM outputs and analog actuators.
  • Fan speed control – Regulating speed using a 0-10 V input.

Imagine you need:

an ACE-11 PLC (6 DI + 6 DO) at 59€ or an ACE-1630 PLC (3 DI + 3 DO + 3 AI + RS232) at 89€ but an analog output is missing!

You can use one of its digital outputs, as PWM output, to add a 0-10V analogue output.

This converter is inexpensive, well designed electronically and reliable. It has 6 connection terminals. You can buy it here

Convert 0-100% PWM digital signal to analogue signal
Linear conversion, 1% accuracy, 200 ms delay
Analog output:

  • Adjustable from 0-5 to 0-10 V (default)
  • Current output 15 mA max

Digital PWM input:

  • From 4.5 V to 28 V (need > 3.5 mA)
  • NPN-OC or PNP
  • PWM 50 Hz – 2 kHz (2 kHz recommended)

Power supply from 16 to 30 VDC, 100 mA
with reverse polarity protection
Integrated DIN-Rail Bracket + 3 leds
Dimensions: 55 x 50 x 33 mm

Note: This new version accepts 4.5 V to 28 V on its PWM input, without the need to select the voltage via a jumper.

The connection diagram

First, wire the (+) to the 24 VDC (+) to get a 24 VDC on digital output:

Outputs wiring description

  • (+) > VDC (+)
  • (-) > GND (-)
  • OUTPUT > DIN- (see bellow)

Wiring of the PWM converter at the output of the ACE PLC :

CONVERTER
PWM TO 0-10V		   ACE PLC
DIGITAL OUTPUT
PWM – IN < > One of its digital output (NPN)
PWM + IN < > + 4.5 – 28 VDC
24 V + IN < > + 24 VDC
24 V – IN < > GND – (Same as the ACE PLC)
0-10V – OUT < > GND Ouput – (Optional, it is the same as above)
0-10V + OUT < > Your 0-5/10 V for your external device

 

The subroutine for easy integration

We provide you with this subroutine to convert the requested output value into a PWM value and apply it to the PLC output.

You can import this subroutine (PWM_To_ANA.viofs) in your ACE PLC project.

The best value for the PWM signal frequency for this product is 0.3 kHz. We have set the “Period Length” to 3000 microseconds.

See “PWM – Pulse-width Modulation” page for more information on PWM if you wish to understand this function.

And we scale the values: For example, if you ask 5400 mV (5.4 V), the subroutine set the “On Time” at 1500 microseconds.

 

Converter calibration

You can use the above subroutine for calibration

  • Ask with the subroutine, the value 5400 mV for OutAnaMV
  • With a voltmeter, measure the output.
  • Open the case: 2 screws, one at the bottom left and one at the top right behind the label!
  • With a screwdriver, turn the potentiometer until you get the value 5.4 V / 5400 mV
  • Done!