Rockwell Automation 57C442 Data Highway Plus Interface Module - Manual (Page 11)

2-1
2.0 MECHANICAL/ELECTRICAL
DESCRIPTION
This section describes the mechanical and electrical characteristics of
the Data Highway Plus Interface module.
2.1 Mechanical Description
The Data Highway Plus Interface module is a printed circuit assembly
that plugs into the backplane of an AutoMax rack. The module consists
of a printed circuit board, faceplate, and protective enclosure. The
faceplate contains ejector tabs at the top and bottom to simplify
removing the module from the rack. See figure 2.1 for an illustration of
the module faceplate.
The 6-pin Phoenix Combicon connector on the faceplate is used to
make the connection to the Data Highway Plus network by means of a
standard twin-axial cable. Refer to Appendix C or to Data Highway Plus
documentation for the cable connections.
The two thumbwheel switches on the faceplate are used to set the
module’s stationnumber (in octal) on the Data Highway Plus network.
The upper thumbwheel switch represents the most significant digit; the
lower thumbwheel switch represents the least significant digit. If you set
the switches to invalid octal digits (8 or 9), the station number will not be
accepted and module error code ”6” will be displayed on the seven-
segment LED.
For diagnostic purposes, the faceplate contains a seven-segment LED
which displays error codes. The error codes are defined in Appendix D.
A green status LED (labeled ”OK”) on the faceplate indicates when the
module is operational (ON) or when it should be replaced (OFF).