APPENDIX D
I/O MODULE DATA SHEETS
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This appendix is included to provide a place in which to store the l/O
module data sheets that are packed with each module.
There are two types of modules that are available for use with the MICRO
84; discrete modules and register modules.
DISCRETE MODULES
A discrete module is used to isolate, convert, and condition discrete
signals that pass between the user’s device being controlled and the
MICRO 84 Programmable Controller. A discrete signal is one that indicates
the on or off condition of the device. A discrete input module converts the
voltage level received from a control device (pushbutton, limit switch, etc.)
to a voltage level that can be used within the programmable controller.
Conversely, an output module converts the output voltage from the
programmable controller to a voltage level that can be used to control a
user device (motor-starter, solenoid valve, etc.).
REGISTER MODULES
A register module is used to isolate, convert, and condition binary-coded
decimal (BCD) and analog (voltage or current) signals that pass between
the user’s device being controlled and the MICRO 84 Programmable Con-
troller. A BCD signal is a numeric value in the range of O-999. A register in-
put module converts the input signals to numeric values usable by the pro-
grammable controller. A register output module converts the numeric out-
put of the programmable controller to signals usable by the user’s device.
Standard hardware to encode and decode BCD numbers is commonly
available.
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