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313
Troubleshooting
Section 8-2
Seven-segment Display
The 7-segment digits show the C200H I/O Link Unit’s node address during
normal operation, but alternate between the error code and the Unit’s node
address when an error occurs. The following table outlines the operation of
the display.
The following diagram illustrates the alternating display of the error code and
error node address.
If more then one error occurs at the same time, each error code will be dis-
played in sequence, followed at the end by the error node address.
8-2
Troubleshooting
8-2-1
Slave Unit Troubleshooting
Red Indicator
(ON or Flashing)
Use the following table to troubleshoot problems in a Slave that has a red indi-
cator that is ON or flashing.
Status
Display
Error
Watchdog timer
Not lit
Memory or system
error
Error code only
Lit
Other errors
Error code and error node address
alternate (see diagram below)
OFF (0.3 s)
Error code
(1 s)
OFF (0.3 s)
OFF (0.3 s)
OFF (0.3 s)
Node address
(1 s)
Error code
(1 s)
Error
Probable cause
The MS indicator is a constant red.
The Slave Unit is faulty. Replace the Unit.
The MS indicator is flashing red.
• Check that the Slave’s baud rate setting is correct. The setting must
be 125 kbps, 250 kbps, or 500 kbps. Restart the Unit after changing
the baud rate.
• Replace the Unit if the MS indicator continues to flash red even
though the baud rate setting is correct.
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