QTech Data Systems Q26 Digital I__O Expansion Module - Manual (Page 3)

DATRAN II eXcel –Q26 Quick Start Guide – v2.0 – September 2010
Supply Voltage and Connections
The module is able to operate from 12V - 30VDC.
The module power connector has three connections labeled “G”, “+” and “C”.
G Power Supply Negative
+ Power Supply Positive (12V – 30VDC)
C Option for remote power control from a
master RTU.
The “C” terminal is a control INPUT. Do not connect it to the supply
Digital Inputs
The module’s digital inputs are designed to interface easily with physical
switching devices. They have an internal pull-up resistor that will pull the
input terminal to the power supply ‘+’ when the input is open circuit (the
“OFF” state).
To turn a digital input ON, connect it (via a set of contacts if necessary)
to the common “G” terminal on the Digital Input terminal block. All “G”
terminals on the module are tied internally to the “G” terminal on the
power supply connector.
The module has 16 digital inputs with an LED associated with each. This
will illuminate when the input is Active/On/Closed.
The pull up / pull down convention is different from some PLCs. If required, the
active state of I/O can be inverted in the eXcel control program or PLC