AMETEK 2120 PLC Interface Module - Manual (Page 7)

Installation and Programming Manual
Chapter 2: Hardware Overview
3
2.2: Input/Output Modules
2.1: Standard Modules
This section provides descriptions of basic Interface Modules (also see Section 2.2: Input/Output
Modules).
Controller (FMMP01)
This module contains the Central Processing Unit (CPU) which is used to process data it receives from
the resolver or Linear Displacement Transducer (LDT). It then shows the position on the Interface
display. The controller is also responsible for continuously monitoring all programmed setpoints and
timing functions. To store programmed functions, including fi xed settings, the controller contains
battery-backed memory. This battery requires no maintenance and is non-replaceable. To allow for
remote communications with the Interface Module, RS-232 and RS-485 serial ports are available through
a D9 connector. The controller is located in slot 1 of the enclosure. (For wiring instructions, see Section
3.2: Wiring)
Power Supply (FMPS01)
This module supplies power to the Interface Module. It also contains a fault check relay and an auxiliary
input. The fault check relay is designed to take power away from the operating machine when a fault
occurs during machine operation, or when power is taken away from the Interface Module. In order for
this to perform it’s intended function, the fault check relay must be properly wired to the machine’s safety
interlock. For a listing of errors which will cause the fault check relay to deenergize, see Chart A-4 in
Appendix A: Error Messages. The auxiliary input is designed for the Move Detection Time-out and
Position Hold functions and accepts an 85-265 VAC input signal. The power supply is located in slot 5 of
the enclosure. (For wiring instructions, see Section 3.2: Wiring.)
The PLC Interface Module can be used with a resolver or Linear Displacement Transducer (LDT). Either
input module will be located in slot 3 of the enclosure. You can identify the module type by the name
found on the back of the module.
Resolver (FMIR01) Input Option R1
This module is used with a Gemco resolver. The resolver assembly consists of a highly accurate and
repeatable brushless resolver, housed in an industrial-grade enclosure. The shaft position is calculated
from two analog signals that vary as a function of the angular rotation of the input shaft.
The brushless resolver works on the same principle as a rotary transformer to couple power into the rotor.
The construction of the brushless resolver consists of a two-phase stator and a single-phase rotor. Each
stator is positioned 90° apart from each other. The two stators continually provide two different output
voltages. Using these two outputs, the module performs a ratiometric conversion and provides an absolute
position. This results in a highly accurate and repeatable transducer having excellent reliability with an
infi nite resolution which can be converted by a resolver-to-digital converter into digital position data. This
module also provides the reset-to-preset input terminals. An input at these terminals will reset the position
display and outputs to a preprogrammed value. This input can be used to continuously compensate for
position drift caused by slippage in the drive mechanism turning the resolver.