Toshiba Programmable Controller PROSEC T3 - Manual (Page 91)

6. Troubleshooting
When “Receive timeout“ is displayed on the screen,
communications between the programmer (T-PDS) and T3 are not
established. Blinking FAULT or I/O LEDs indicates a failure of the
CPU. If this state continues even after the power turned ON again,
replace the CPU module with a new one. If “Receive timeout“ is
displayed on the screen while FAULT or I/O is ON and not blinking,
check the setting environment of the programmer (T-PDS) and the
connection cable. If these are correct, the communication circuit of
the CPU module or programmer may have become abnormal.
When the event history is displayed, check the error messages
registered. Error message No.1 indicates the latest event
registered.
The following pages of this manual explain, error messages and
related information, relevant special relays, the status of LEDs after
event occurrences, and their meanings. If an error occurs, identify
the cause of the error based on the error message on the screen
and take necessary measures.
In the error-down state, operations to correct the program are not
accepted. In this case, execute Error reset from the programmer to
return to the HALT mode before starting the correction operation.
To activate RUN again, turn the operation mode switch to HALT and
change to RUN (or P-RUN), or execute an operation command from
the programmer.
CATION If the CPU module has an EEPROM or an IC memory
card, the program of the EEPROM or the IC memory
card will be transferred to RAM when the RAM/ROM
switch is set to ROM and RUN is activated (except when
the operation mode switch is set to P-RUN): in this case,
the corrections on RAM memory will be lost. Therefore,
to check the operation of a program corrected in the RUN
mode, turn the RAM/ROM switch to RAM before
activating RUN.
The meanings of LED displays shown in the tables on the following
pages and onward are as follows;
• : U
0;Not Lit
3: Blinking
—: No effect on state
User's manual - Hardware
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