Rockwell Automation 1771-KA2 Communication Adapter Module - Manual (Page 17)

Station Hardware
Chapter 2
2-7
PROG
The red program status indicator tells you the status of module checks on
the communication zone rungs of the user program. (The section titled
“Overall Format,” chapter 5, describes these rungs.) The module first
checks these rungs at power-up. When it locates the header rung of this
zone, the module turns the PROG indicator on. After it checks the rungs,
provided no errors are found, the module turns the PROG indicator OFF.
However, if the module detects any programming error in the
communication zone of the program, this indicator remains ON. In this
event, the module cannot function. You must check the communication
zone of the program and correct any errors. (Start-up procedures are
described in chapter 9.)
PROC
The red processor link status indicator gives the status of error-checking
diagnostics for communication adapter/processor communication. The
PROC indicator is normally off.
Should the 1771-KA2 module detect an error in data transmission with
the processor, it turns the PROC indicator on. This may mean one of the
following:
Disconnection of the Data Highway/Processor cable between the
communication adapter and the processor
Fault in processor operation
Incorrect selection of processor link communication rate on the module
(Refer to section titled “Write Option Switch Assembly,” chapter 3).
The section titled “Module Indicators,” in chapter 9, describes the use of
indicators in troubleshooting.
Switches
There are 3 sets of switches on the 1771-KA2 module circuit board. These
switches are beneath the small switch cover plate on the component-side
cover of the module. (Refer to Figure 2.3).
The programmer selects the settings of these switches for each
communication adapter module, based upon such variables as station
number, command capabilities, and type of station processor. Switch
settings are a part of module installation, described in chapter 3.