Combination analog inputs and analog outputs

Certain ACE PLCs have a single connector with both analog inputs and outputs.

The connections are as shown on the diagram at the right.

The first few signals on the port are analog inputs. They are 12 bit analogs, described in the analog input description. Typically, there are either 3 or 4 analog inputs in a combination port.
The last signals on a combination port are analog outputs. For the Ace 7096 these are 16 bit resolution outputs, which can be individually configured, using vBuilder for either 0-5V or 0-10V operation, as shown below.

There is no need to connect anything to pin 8 (VA). It is like pin 8 on the digital input and output ports – connected to 5V via a 10 ohm resistor and a diode.

Issues

If connecting to an analogue output causes the CPU to reset, this suggests that the external connection is drawing a lot of current. Adding an in-line resistor will limit the current, but if the device to which it is connected is drawing a lot of current, the voltage after the resistor will probably be reduced. Try measuring the voltage at the input and output of the resistor.