Rockwell Automation 57C400-1 115V AC/DC Input Module - Manual (Page 9)

2Ć1
2.0 MECHANICAL/ELECTRICAL
DESCRIPTION
The following is a description of the faceplate LEDs, field
termination connectors, and electrical characteristics of the field
connections.
2.1 Mechanical Description
The input module is a printed circuit board assembly that plugs into
the backplane of the DCS 5000/AutoMax rack. It consists of a printed
circuit board, a faceplate, and a protective enclosure. The faceplate
contains tabs at the top and bottom to simplify removing the module
from the rack. Module dimensions are listed in Appendix A.
The faceplate of the module contains a female connector socket and
sixteen LED indicators that show the status of the inputs. Input
signals are brought into the module via a multiĆconductor cable
(M/N 57C370; see Appendix D). One end of this cable attaches to the
faceplate connector, while the other end of the cable has stakeĆon
connectors that attach to a terminal strip for easy field wiring. The
faceplate connector socket and cable plug are keyed to prevent the
cable from being plugged into the wrong module.
On the back of the module are two edge connectors that attach to
the system backplane.
2.2 Electrical Description
The input module contains 16 input circuits for 115 volt AĆC or DĆC
logic signals. Each group of four circuits shares a single isolated
common. Input signals have 2500 volt isolation to logic common.
Refer to the block diagram in Appendix B.
Each input circuit consists of a current limiting resistor, a full wave
bridge rectifier, an optical isolator, and a filter to eliminate spurious
signals. A circuit diagram is shown in figure 2.1.
115V
INPUT
C
TO LOGIC
CIRCUITS
RECTIFIER
ISOLATOR
+5V
Figure 2.1 Ć Typical Input Circuit