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166
Troubleshooting Flowcharts
Section 8-4
8-4
Troubleshooting Flowcharts
Use the following flowcharts to troubleshoot errors that occur during opera-
tion.
Main Check
I/O BUS ERR
C0
An error has occurred during data transfer between the CPU Board and an Expansion I/
O Board. Check the Board’s connecting cable.
I/O UNIT OVER
E1
Too many Expansion I/O Boards have been connected. Check the Board configuration.
SYS FAIL FALS**
(** is 01 to 99 or 9F.)
01 to 99 A FALS(07) instruction has been executed in the program. Check the FALS number to
determine the conditions that caused execution, correct the cause, and clear the error.
9F
The cycle time has exceeded the Maximum (Watch) Cycle Time setting (DM 6618).
Check the cycle time and adjust the Maximum Cycle Time setting if necessary.
Message
FALS
No.
Meaning and appropriate response
Error
Replace the CPU
Board.
PWR indicator lit?
RUN indicator lit?
ERR indicator
flashing?
Is I/O sequence
normal?
Operating
environment normal?
Yes
No
No
No
No
Flashing
Yes
Yes
Not lit
Yes
Check power supply. (See page 167.)
Operation stopped. Check for fatal errors.
(See page 167.)
Check for non-fatal errors. (See page 169.)
Check I/O. (See page 170.)
Check operating environment. (See page 172.)
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