AMETEK 2120 PLC Interface Module - Manual (Page 8)

4 Installation and Programming Manual
Chapter 2: Hardware Overview
Variable Pulse (FMIP01) Input Option V1
This module is used with an LDT that provides its output in the form of a pulse width modulated RS-422
signal. This module only works with Gemco Series 951VP2110 LDT’s.
LDT Input (FMIP02) Input Option L1
This module will accept an output from a controlled pulse, start stop pulse or variable pulse
magnetostructive LDT. This card accepts a wide range of LDT inputs and provides faster updates than
the variable pulse version described above.
It allows the PLC Interface Module to receive the signals from the LDT. The pulse width signal is
converted to position data which the monitor displays. The module also provides +24 VDC to supply
power to the LDT. The module was designed to work with the Gemco Series 951 or 952CP or RS LDT.
However, other LDTs can be used with the module. If you are using a different type of LDT, contact the
factory for wiring and programming instructions.
This module also contains reset-to-preset input terminals. A signal at this input will reset the position
display and outputs to a preprogrammed value. This feature is useful for quick recalibration of the
system to a gauge block or known machine position.
Digital Output (FMOD01) Output Option D1, D2 or D3
This module is used to transmit parallel digital output data to a PLC or personal computer. The digital
output is fi eld confi gurable for position or velocity data in a binary, BCD or grey code format. This data
is updated every 50 microseconds. The electrical characteristics of this output data can be current sinking,
current sourcing or TTL which must be specifi ed in the module’s part number.
This module also provides two input pins for use as a fi eld confi gured latch or synchronized handshake
input. The latch input freezes the digital output data while the PLC reads it. The data is updated when the
input is released. When confi gured for synchronized handshake, the PLC must provide a clocked square
wave input into these input pins. Digital data is updated on each transition of the square wave and the PLC
is synchronized to read the updated position data after a 100 microsecond settling time.
This input accepts a 5 to 24 VDC source from the PLC to perform the latch or synchronized handshake
function described above. For details on wiring to the digital output board, see pages 17 & 18.
Analog Output (FMOA01) Output Option A1
This module is used to transmit position or velocity data to a PLC in an analog format. The module
provides two separate analog output channels that can be independently confi gured for position or
velocity data.
These analog outputs can be fi eld scaled over any range and confi gured for 0 - 10 VDC, 10 - 0 VDC,
-10 VDC to +10 VDC, 4 - 20 mA, 20 - 4 mA, 0 - 20 ma or 20 - 0 mA.
For applications that require remote indication it is recommended to use an aftermarket analog input
display or a digital input display. When using one of these displays the optional analog or digital output
board must be specifi ed in the part number.