Rockwell Automation 1770-KF2 Data Highway or Highway Plus Interface Module User Manual - Manual (Page 7)

Introduction
Chapter 1
1-3
Figure 1.1 shows the 1770-KF2 module’s hardware features:
Diagnostic Indicators
Connectors for Data Highway and RS-232-C Devices
Communication Option Switches
On/Off Switch, Power Plug, Fuse, and Voltage Select Switch
Figure 1.1
1770-KF2 Communication Interface Module
XMTG RCVG RDY ACTV CPU PWR
ALLEN–BRADLEY
DATA HIGHWAY
COMMUNICATION INTERFACE
A KF2 also features extensive self-diagnostics. At power-up, tests are run
on internal memory, timers, and firmware integrity. Any failure causes
the red front-panel CPU indicator to flash. Also, the module continuously
checks the memory and firmware during operation.
Module Description