CTEK Z1204 Relay Module - Manual (Page 11)

TN0019 – Z1216 I/O and Z1204 Relay Module
Hardware Configuration
TN0019 - 28 March, 2011
11
Figure 11 - Digital Output Connections
Input Connections:
The Z1216 input connections support digital inputs, analog inputs, and pulse inputs. Pulse inputs are a
special class of digital inputs that invoke counting and storage. Pulse inputs have the same electrical
specifications as standard digital inputs. The mode of operation (analog, digital, or pulse) is independently
set for each input terminal under software control.
Digital Inputs: Digital inputs can be used to sense contact closure, power status or other discrete events.
Each input should be pulled high or low in its steady state by connecting the input through a current
limiting resistor to the modules reference voltage or ground. Figure 12 shows a simplified input circuit.