Rockwell Automation 1771-KA2 Communication Adapter Module - Manual (Page 111)

Start–up and Troubleshooting
Chapter 9
9-9
Appendix A lists each ERROR CODE and its meaning.
Figure 9.4
Header Rung
L
02707 011
G
077
CEE
G
015
G
Local
Station No.
Storage Word
Location
Timeout
Preset Code
Error Code
Test Rungs (Optional)
For start-up and troubleshooting testing, you must have some means for
control of each START bit. To execute a command during testing, you
can energize the START bit for each command. Here’s the way it
happens:
The START bit is controlled by a rung of the user application program.
The most direct way to control this bit in troubleshooting, therefore, is to
manipulate the conditions of the rung to energize the START bit. If this
can be done easily for each START bit at a station processor, no special
procedure for command initiation is necessary.
However, it may not always be practical to simulate application
conditions for the purpose of command testing. In this case, a special set
of test rungs can be added at the end of the user program. Using these
rungs, the programmer control command initiation directly from the
programming terminal.
CAUTION: Do not alter the application program for
troubleshooting purposes. This can cause undesired machine
operation, since the program may no longer operate as had been
intended.
The optional test rungs described here are recommended with this caution
in mind. The specific format of these rungs allows control of commands
without altering the main body of the application program. Because these
tests rungs are within a ZCL area, the output instructions of these rungs
are executed only under strict programmer-controlled conditions and only
when the programming terminal is connected. Except where intentionally
activated by the proper key sequence, these rungs are ignored by program
logic in normal operation.