Rockwell Automation 2705 REDIPANEL KEYPAD MODULE USER MANUAL - Manual (Page 82)

Chapter 8
Maintenance and Troubleshooting
8–2
The COMM Indicator
Any communication faults or errors are indicated by the green LED labeled
COMM. The LED can be in one of three states:
1. OFF
2. ON
3. Blinking
COMM OFF
When COMM indicator is OFF:
1. The module is not receiving input power.
2. The module is operating correctly, but no communications is occurring at
this time. Check the Remote I/O Link wiring.
3. The module is the last rack, but the DIP switch indicating this state is not
in the OFF position.
COMM ON
When COMM indicator is ON:
1. The module is operating correctly and no communications faults have
been found.
COMM Blinking
When COMM indicator is blinking:
The COMM indicator blinks if the PLC is in the program or test mode.
If you receive an error message during power–up, clear the error and recycle
power to the module. Since error conditions may “stack up”, you may have
to repeat the power–up, clear error, power–up cycle several times to clear all
errors.
Since the Keypad Module is part of an integrated system, you must evaluate
the entire system when a fault is detected. Start your troubleshooting by
asking these basic questions:
•
Is the rack address set properly? Refer to Chapter 5.
•
Are the baud rates of the Keypad Module and the Scanner Module the
same? Refer to Chapter 5.
•
Is the Keypad Module the last module in a physical rack, and has it been
identified as the last rack? Refer to Chapter 5.
•
Is the communication connector securely plugged in at both the Keypad
Module end and the Scanner Module end?
Power-Up Sequence Error
Message Display
Basic Troubleshooting
Questions