Onboard I/O

I/O on board

AL300 provides:

• Digital I/O:
  • 8 optoisolated digital inputs
  • 4 dry contact digital inputs
  • 8 digital outputs
• Analog I/O:
  • 4 0-10V analog inputs
  • 2 0-10V analog outputs

Digital inputs and outputs

Digital inputs can be used as pulse counters. The minimum pulse duration and the minimum period between one pulse and the next are 10-50 milliseconds, depending on the number of monitored inputs and the overall load of the AL300.

Optoisolated inputs

Parameter	Value
Quantity of inputs	8
Low-level input voltage	0 - +5 V DC
High-level input voltage	+10 ... +28 V DC
Isolation voltage	5 kV RMS
Input resistance	>=10kOhm

Example of connection to Siemens S7-1200 CPU (1214C)

Dry contact inputs

Digital outputs

AL300 has 8 open-collector digital outputs. This figure shows the recommended connection of LEDs (a) and relays (b,c) to the open-collector outputs. The internal diodes protect the output transistors from transient voltage spikes (b). In the case of long cables to the relay, the connection with an external diode is recommended (c).

Parameter	Value
Quantity of outputs	8
Maximum current	500 mA
Maximum voltage	28 V DC

Analog inputs and outputs

AL300 has 4 0-10V analog inputs and 2 0-10V analog outputs.