124
Troubleshooting Using the Error Log
Section 4-3
Note
n = CIO 1500 + (25 x unit number).
4-3
Troubleshooting Using the Error Log
4-3-1
Error Log Overview
The PROFIBUS Master Unit maintains an Error Log, which contains the
reports on specific error events.
Logged Errors
The following errors are recorded in the error log.
• Errors in network operation
• Errors in data transfers
• Error in the CPU Unit
Error Log Records
Each error is recorded as one record in an error log table. Each record con-
tains:
• A main error code
• A detailed error code
• A time stamp (from the clock in the CPU Unit)
Error Log Location
When an error is detected, the error codes and time stamp are recorded in an
error log record, which is stored in the error login volatile memory (i.e. RAM
memory) inside the PROFIBUS Master Unit. Serious errors are also recorded
in non-volatile memory (i.e. Flash ROM).
A total of 80 error records can be logged in volatile memory.
Up to 16 more serious system errors are also copied to non-volatile memory.
PROFIBUS Master Unit is
configured. All slaves are in
data exchange, but the out-
puts of some slave devices
are not updated.
The specified slave devices may be in Sync
mode.
Send a Global-Control Unsync command to
the targeted slave or group of slaves. Use
either the Global-Control feature in CIO
Words (refer to the CS1/CJ1W-PRM21 Oper-
ation Manual, W409-E2-
@
).
The specified slave device may have its
watchdog disabled and is disconnected from
the network, due to a cabling problem.
• BF LED indicator is Flashing.
• CIO Words n+9 to n+16 (see Note) show
which slaves have problems.
• Use CX-Profibus and DTMs to determine
slave diagnostics.
Verify that the specified slave device is still
connected to the network.
PROFIBUS Master Unit is
configured. All slaves are in
data exchange, but the
inputs of some slave
devices are not updated.
The specified slave devices may be in
Freeze mode.
Send a Global-Control Unfreeze command to
the targeted slave or group of slaves. Use
either the Global-Control feature in CIO
Words (refer to the CS1/CJ1W-PRM21 Oper-
ation Manual, W409-E2-
@
).
The specified slave device may have its
watchdog disabled and is disconnected from
the network, due to a cabling problem.
• BF LED indicator is Flashing.
• CIO Words n+9 to n+16 (see Note) show
which slaves have problems.
• Use CX-Profibus and DTMs to determine
slave diagnostics.
Verify that the specified slave device is still
connected to the network.
Problem
Probable cause
Correction
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