Continuum I/O System Reference
17
Individual Module Characteristics
This section of the document describes the various I/O modules and presents interfacing
information. Each module is presented in its own mini-section. The part number
designator for the module being described is printed on the outer edge of each page.
General Wiring Concerns for All Modules
Do not remotely ground any part of the input sensor wiring. Remote grounds connected
to the return terminal could make the system operate incorrectly or damage the
equipment. The signal return is not true earth ground. It is an electronic reference point
necessary to interpret the sensor properly.
It is recommended that you run input wiring in a conduit separate from AC power or
output wiring and avoid long wiring runs.
For reliable input operation, follow these input wiring guidelines:
•
Never lay wires across the surface of a printed circuit board.
•
Wires should never be within 1 in. or 25 mm of any component on a printed
circuit board.
•
Use shielded input wire.
•
Terminate the shield of the input wires at one end of the run only—preferably at
the end where your I/O module is located.
•
Be careful when stripping wire not to drop small pieces of wire inside the cabinet.
•
Don’t run your input wiring in the same conduit with AC power.
•
Don’t run your input wiring in the same conduit with your output wiring.
Grounding the Modules
Each module includes a screw terminal connection for Earth ground. It is important that
this connection be made as close to the module as possible.
Caution
Do not externally ground any input signal connected to the module. This may
damage the unit. Signal return terminals are not connected to Earth Ground.
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