G&L MMC-A2, Hardware Manual

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Appendix A
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Operation Details
G & L Motion Control Inc. MMC Hardware Manual 171
Appendix A - Operation Details
A.1 Introduction
This appendix describes in detail the operation of many of the sub-systems found
within the MMC Control and Option Modules.
A.2 DC Inputs
Each input is guaranteed “on” at 14 to 30 VDC and guaranteed
“off” at 0 to 5 VDC (polarity doesn't matter). Its on/off state is
converted to a corresponding logic 1 or 0. This logic state is
transmitted through the system bus to the application program,
which uses these logic states to control program flow. The logic
side of the input is optically isolated from the field side.
The shaded blocks in Figure A-1 below show the limits specified
by the IEC. The lines show the maximum and minimum V/I of the
inputs in this module. The voltage/current curve in this graph shows
that the input module is well within the IEC Type 1 limits.