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L-23
4 Programming
4.7 Error Status
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX3U-4AD-TC-ADP (4-channel Thermocouple Data Input)
K
FX
3U
-4AD-PNK
-ADP
L
FX
3U
-4AD-TC
-ADP
M
PID Instruction
(FNC 88)
4.7 Error Status
If an error is detected on TC-ADP, the error status data will be stored in the corresponding special data
register.
The following table shows the special data registers that store the error status data:
•FX
3U, FX3UC Series PLC
•FX
3G Series PLC
Check the ON/OFF status of each bit of the error status data register to determine the error. Errors are
assigned to the bits as shown in the following table. Create a program to detect errors.
1. Caution regarding use of error status data
If a TC-ADP hardware error (b6) or TC-ADP communication data error (b7) is once detected, it is necessary
to clear the error status with a program at next power-on of the PLC.
For this reason, be sure to create the following program:
•For FX
3G, FX3U, FX3UC Series PLC
*1. "1st" for the FX
3G PLC.
Special data register
Description
1st 2nd 3rd 4th
D8268 D8278 D8288 D8298 Stores the error status data.
Special data register
Description
1st 2nd
D8288 D8298 Stores the error status data.
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 - -
Error status in the 3rd
*1
analog special adapte
r
b6 = OFF (hardware error)
Error status in the 3rd
*1
analog special adapte
r
b7 = OFF (communication data error)
M8002
Initial pulse
Normally
ON
RST M6
RST M7
M8000
MOV
K4M0 D8288
MOV
D8288 K4M0