Rockwell Automation 1770-KF3 DH-485 Communication Interface User Manual - Manual (Page 45)

Troubleshooting the KF3
Chapter 5
5Ć2
The numeric displays are used to indicate hardware fault conditions.
When the front panel fault indicator is lit, the left display will show a
number indicating the type of hardware fault. Table 5.B gives a
description of the faults.
Table 5.B
Hardware Faults
This number: Indicates this fault:
Processor Fault. A hardware fault was detected in the processor. This is
a major fault requiring the module to be returned for servicing.
EPROM fault. The checksum stored in the EPROM does not match
the actual checksum for the EPROM. This indicates bad cells in the
EPROM. This is a major fault requiring the module to be returned for
servicing.
RAM Fault. The static RAM cannot be reliably written to. This is a major
fault requiring the module to be returned for servicing.
Stuck Button Detected. One or more of the push buttons are stuck on.
This could be caused by a mechanical problem with the buttons, or by
some object pressing on the push buttons. If the cause is mechanical,
the module should be returned for servicing. Otherwise, remove the
pressure from the push buttons. This should clear the fault condition.
The KF3 will continue to communicate when this fault is detected, but
configuration will not be possible.
EPROM Write Fault. The Flash EPROM could not be burned correctly
during download of new firmware. This is a major fault requiring the
module to be returned for servicing.
EEPROM Major Fault. The KF3 was unable to write the new
configuration to the EEPROM. This is a major fault requiring the module
to be returned for servicing.
EEPROM Minor Fault. On power up, the KF3 detected invalid
configuration data in the EEPROM. The KF3 was able to recover by
writing the factory default configuration to the EEPROM. You must power
the module off and back on, and then reconfigure it. This is not a major
fault, but if the problem persists, the module should be returned for
servicing.
Power Failure. The power supply voltage is below the minimum rating for
the KF3.
If your displays show meaningless symbols at startup, or if any values
other than the above are displayed, your module is malfunctioning.
Contact your A-B representative.
When you connect the module to your network and turn it on, the displays
will cycle through the numbers 1-3 and then turn off. If your DH-485
parameters are correctly configured, the DH-485 Activity LED on the front
of the module will light up. If the Fault LED lights up instead, check your
station address, as stated in Parameter Number 0, Table 3.B. If no lights
come on, check your DH-485 Baud Rate setting (Table 3.B, Parameter 1).
Interpreting the Numeric
Displays