How to wire digital inputs?
ACE digital inputs are NPN transistor inputs. NPN Inputs = Positive logic.
The logic is the following:
- When the INPUT is linked to VDC (+), the input = 1
- When the INPUT is not connected to anything or the voltage is less than 0.8 VDC, the input = 0
|Your sensor (here, the dry contact) must be connected to:
|The ACE inputs are connected:
(+) is not used or only for dry contacts.
- VDC (+) is the + of your power supply. From 3 to 30 VDC.
- GND (-) is the – of your power supply.
- (+) it is often the last pin of your connector
- (-) it is often the first pin of your connector
- INPUT is an input of your ACE PLC
How to wire the input to a dry contact (Push button, relay contact,..)?
with a external voltage
Nothing on the (+) of the ACE PLC!
with voltage provide by the ACE PLC
Do not use this 5 VDC to power anything
How to wire the input to an encoder or PNP sensor?
Sensor with an internal pull-up resistor
Sensor without an internal pull-up resistor
Some entry-level sensors do not include a pull-up resistor.
Read more: What sort of typical digital input signals that may be connected to the ACE digital inputs?
Mechanical contact bounce
ACE digital inputs and the ACE CPU are very fast. For a small program, the logic scan and input scan can occur 5 times per millisecond. At this rate, mechanical contact bounce can signal the program that an input is changing rapidly – which can be a problem.
|To remedy this situation, vBuilder has an option to allow you to filter the digital inputs.
Note that debounce does not apply to inputs configured as high speed pulse counter inputs.
High speed pulse counters
Using vBuilder, 3 high speed pulse counters can be configured for:
- basic high speed pulse counting (one digital input)
- quadrature pulse counting (two digital inputs)
The same signal level requirements apply, as listed above.
Digital AC signals inputs: 24 VAC or 120 VAC
For digital inputs that are AC signals, the ACE’s digital input ports can be connected to Velocio Optocoupled Input Terminal Block modules.
A cable, supplied with each terminal block module is then connected to the ACE digital input port.
The Optocoupler Input Terminal Block modules convert the AC signals to the proper DC levels to the PLC.