AMETEK 2120 PLC Interface Module - Manual (Page 5)

1 Installation and Programming Manual
Chapter 1: Theory of Operation
The Gemco Series 2120 PLC Interface Module converts the input signal from a resolver based
rotary transducer or Magnetostrictive Linear Displacement Transducer (LDT) to digital analog or
overtravel relay outputs. Resolver based inputs provide up to 14 bit resolution per turn with a
fi eld programmable scale factor. LDT based inputs allow fi eld selection of position data in inches
to .001 inches or millimeters to .01 millimeter. The module’s 6 digit display can show position
or velocity data. The optional 20 bit digital output board allows fi eld confi guration of parallel
digital outputs in a binary, BCD or grey code format. The optional analog output board allows
fi eld selection of a voltage or current output of position or velocity and is scalable over any
portion of the displayed data. The optional relay output board provides two mechanical relay
outputs intended for use as overtravel limits.
Advanced features include:
Reset-to-Preset input for continuous recalibration or compensation for process
drift.
Turns counting software for multiple turn applications using a single turn resolver.
Move detection software for detection of a jammed motor driven mechanism or
drive component failure.
Position hold input to freeze displayed data during high vibration periods at the
sensor.
Field programmed data is protected by a hard contact closure on the back of the module and a
user selectable security code.
Chapter 1: Theory of Operation