Measurement Computing PointScan 100 Series rev.1.0 - Manual (Page 23)

PointScan/100 User’s Manual 8-28-01 Discrete Output Modules 5-1
Discrete Output Modules 5
This section documents the following module
PointScan/142
PointScan/142
High Density Discrete Output Module
Overview
Sixteen discrete output channels each provide up to 1 Amp DC to motor contactors, valves, and other loads.
Inductive surge protection is provided. Each of the sixteen outputs may optionally be configured as Time
Proportioned Outputs that pulse ON at a duty cycle proportional to an analog output register value.
Typically these TPO outputs are controlled by a PID loop or other process algorithm in a control program.
More information can be found in the on-line help supplied with the IO Toolkit program.
Number of Channels 16 discrete outputs connected to a common DC source
Output Voltage Range 10 - 30 VDC
Max. Load per Output 1 Amp
Max. Load per Module 8 Amps
Max. Inrush Current 5 Amps (for 100 mS)
Wiring
A single terminal is provided for each output channel. All outputs are powered from the DC power
terminal. All channels are referenced to a common return, which is connected to the negative side (ground)
of the DC power source.
TPO Feature
Time proportioned outputs pulse ON and OFF with a duty cycle proportional to an analog value stored in
an analog output register. TPO outputs are a low cost way to get smooth proportional control of heaters and
other process variables. Typically, TPO analog output registers are assigned to the output of PID or other
control program. Use the IO Toolkit to set pulse cycling as fast as 10 mS or as slow (many minutes) as your
system dynamics require. Each output may be configured as a TPO or ordinary discrete output.
I/O Registers
Function IOtech Registers Modbus Registers
Discrete Outputs Y0 – Y15 00001 – 00016
TPO Values AY0 – AY15 40001 – 40016