Measurement Computing PointScan 100 Series rev.1.0 - Manual (Page 20)

4-2 Discrete I/O Modules 9-12-01 PointScan/100 User’s Manual
PointScan/122
16 Discrete Inputs
Overview
This module provides sixteen input channels. Inputs may be wired as all sourcing or sinking. An input
count feature uses analog input registers to accumulate the positive transitions of each input. More
information on this and other features can be found in the on-line help supplied with
the IO Toolkit program.
Number of Channels 16 discrete inputs (connected to a common source)
Input Voltage Range 12/24 VDC/VAC
Input Current @ 24 VDC 6.7 mA
Wiring and Jumpers
Positive DC or AC voltage must be applied to an input to indicate an ON condition. All channels are
referenced to a common return or supply, which is connected to the negative side (ground) or positive side
(DC+) of the DC power source. One wire from each sourcing field input should be bussed together and
connected to terminal 17 (DC +). One wire from each sinking field input should be bussed together and
connected to terminal 18 (DC GND). Refer to the wiring diagram below. Set jumper W1 to match the
wiring configuration of the inputs.
I/O Registers
Function IOtech Registers Modbus Registers
Discrete Inputs X0 – X15 10001 – 10016
Counter Inputs AX0 – AX15 30001 – 30016