CTEK Z1204 Relay Module - Manual (Page 13)

TN0019 – Z1216 I/O and Z1204 Relay Module
Hardware Configuration
TN0019 - 28 March, 2011
13
Analog Inputs: Inputs configured to operate in analog mode apply 12 bit analog to digital conversion
across an input voltage range of 0 - 5 volts. The reference voltage supplied on the Z1216 + connections is
nominally 5 volts. Ctek's Automation Control application provides a calibration feature to compensate for
minor variations in the reference supply. Sensors designed for other voltage ranges and current loop
sensors such those designed for 4 - 20 ma standard can be easily adapted with simple resistive networks.
Figure 13 shows the Z1216's input and reference connections.
Note - When using an external source of power for analog or digital inputs it is important to take one of
two precautions to avoid ground loops.
1 - Use a completely isolated supply
2. Connect the Z1216 ground to the external supply ground
Figure 13 - Z1216 Analog/Digital Inputs
1 - 8 - Analog/Digital Inputs
0V - Reference ground
+ - Reference supply (5 volts nominal)