CTEK Z1204 Relay Module - Manual (Page 10)

TN0019 – Z1216 I/O and Z1204 Relay Module
Hardware Configuration
TN0019 - 28 March, 2011
10
Z1216 I/O Connections
The Z1216 I/O module provides eight (8) digital outputs and eight multi-function inputs that can be
configured under software control as digital inputs, analog inputs or pulse inputs.
Digital Outputs:
Each digital output provides an open collector circuit capable of sinking 250 ma when all are active or
350 ma individually. Each output is also capable of producing a PWM (pulse width modulation) output
having 8-bit resolution at 7.8kHz.
If an external power supply is used it should be connected to the K input (Fig 11) as well as the load. The
K connection provides diode clamping to minimize spikes caused by inductive loads. The other side of
the load is connected to one of the open collector digital outputs and will be switched to ground when the
output is active. See figure 10.
Warning - The output must never exceed the maximum voltage rating of 30VDC.
Figure 10 - Digital Output Connection
Figure 11 below shows the connections for digital outputs 1 - 8. The K terminal is for the external power
source connection as described above.