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Chapter 8
Troubleshooting and Maintenance
Common Operating
Problems
Error Messages
Message
ROM fail
RAM fail
*.CFG File Invalid
Watch Dog Fault
Push key to continue
Watch Dog Fault
Push Key to Reset
Allen-Bradley SLC 50X
Establishing Comm
Allen-Bradley PLC-5
Establishing Comm
SLC not found
PLC not found
Communication Loss
Press ENTER to Reset
Com Error Code: nnH
Press ENTER to Reset
Attempted Invalid
Screen Access
8–2
If there is no display on the DTAM Micro, verify that 18 to 30 VDC is
present at the terminal connectors. If not, check the power to/from the DC
power source.
The most common problems are related to cabling configurations and the
communication parameters (baud rate, data bits, parity). These parameters
must be identical for both the DTAM Micro and the controller. Cabling and
the communications parameters are always the first things to check.
If the communications cabling and communications parameters are correct,
perform the diagnostic tests (described in this chapter) to rule out any
non-functioning features of the DTAM Micro.
Refer to the following when the DTAM Micro displays an error message.
Probable Cause(s)
Read Only Memory (ROM) is incorrect.
RAM memory failed write or read test.
Application file checksum is incorrect.
Watch dog timer not within specs.
Watch dog timer timed out or pass bits not set.
Attempting to communicate with an SLC.
Attempting to communicate with a PLC.
This display is displayed after a 2 second interval of
attempting to establish communications with the
SLC.
This display is displayed after a 2 second interval of
attempting to establish communications with the
PLC.
Communication with the SLC was lost after 16 at-
tempts.
Communication error code (nn)
Illegal or unprogrammed screen type detected
(.CFG file error).
Corrective Action(s)
Possible defective ROM. Reset the DTAM Micro
and re-check. If problem still exists, re-download
the operating system through the programming soft-
ware. If problem still exists, send DTAM Micro for
repair.
Reset the DTAM Micro and re-check. If problem still
exists, send DTAM Micro for repair.
Possible bad application file. Download the pro-
gram (.CFG) file and re-check.
If problem persists, send DTAM Micro for repair.
If problem persists, send unit for repair.
Normal display when initiating communications with
an SLC.
Normal display when initiating communications with
a PLC.
Communications not established with the SLC.
Check cabling and communications parameters
to verify that the SLC matches those of the DTAM
Micro.
Communications not established with the PLC.
Check cabling and communications parameters
to verify that the PLC matches those of the DTAM
Micro.
Check DTAM Micro to controller cabling. Check
SLC operating conditions.
Received a controller error code. Refer to next sec-
tion for error codes.
Check the program (.CFG) file and download.
Check linking and so on.
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