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L-30
5 Troubleshooting
5.4 Program Check
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX3U-4AD-TC-ADP (4-channel Thermocouple Data Input)
5.4 Program Check
Check the following items for the program:
1. Cancellation of error status at power-on
When the power is turned off and then on again, the error status should be cleared (the b6 and the b7 should
turn off) using the program.
2. Check of storage devices
Verify that different values are not being stored in the same device by the other parts of the programs.
5.5 Error Status Check
If an error occurs in the TC-ADP, the corresponding bit will turn on.
To solve a problem, refer to the troubleshooting method described below:
1. Temperature measurement out of specified range or disconnection of line (b0 to b3)
1) Description of error
The input temperature measurement value is outside the specified range.
The temperature measurement value of thermocouple type K is not in the range between -110
°
C
to
+1010
°
C
, or the temperature measurement value of thermocouple type J is not in the range between
-110
°
C
to +610
°
C
.
Or the line between TC-ADP and the thermocouple is disconnected.
2) Remedy
Check that the input temperature measurement value is within the specified range.
Also check the wiring condition.
2. EEPROM error (b4)
1) Description of error
The adjustment data set in the EEPROM before delivery from our factory is unreadable or is destroyed.
2) Remedy
Please contact the nearest Mitsubishi Electric distributor office.
3. Averaging time setting error (b5)
1) Description of error
The averaging time set for one of the channels (channels 1 to 4) is outside the specified range: 1 to 4095.
2) Remedy
Check that the averaging time is correctly set for each channel.
Bit Description Bit Description
b0
The temperature measurement data of
channel 1 is outside the specified
range, or disconnection is detected.
b5 Averaging time setting error
b1
The temperature measurement data of
channel 2 is outside the specified
range, or disconnection is detected.
b6 TC-ADP hardware error
b2
The temperature measurement data of
channel 3 is outside the specified
range, or disconnection is detected.
b7 TC-ADP communication data error
b3
The temperature measurement data of
channel 4 is outside the specified
range, or disconnection is detected.
b8 to b15 Unused
b4 EEPROM error - -