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4 Programming
4.10 Error Status
FX
3G
/FX
3U
/FX
3UC
PLC User's Manual - Analog Control Edition
FX
3U
-3A-ADP (2-channel analog Input, 1-channel analog output)
4.10 Error Status
If an error is detected in the 3A-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 check the description of the error.
Errors are assigned to the bits as shown in the following table. Create a program to detect errors.
→ For a detailed description of the error status, refer to Section 6.5.
*1. A 3A-ADP hardware error (b6) is valid only when the use of analog input is set.
Detection of power supply error is valid only when the use of analog input channel 2 is set.
*2. A 3A-ADP communication data error (b7) is valid only when the use of analog input is set.
1. Caution regarding use of error status data
If a 3A-ADP hardware error (b6) or 3A-ADP communication data error (b7) is detected, it is necessary to clear
the error status with a program at the next power-on of the PLC.
For this reason, be sure to create the following program:
•FX
3G, FX3U, FX3UC Series PLC
*1. "1st" for the FX
3G PLC.
•FX
3U, FX3UC Series PLC
Special auxiliary relay
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 Channel-1 over-scale detection b5 Averaging time setting error
b1 Channel-2 over-scale detection b6
3A-ADP hardware error
(Power supply error included)
*1
b2 Output data setting error b7
3A-ADP communication data error
*2
b3 Unused b8 to b15 Unused
b4 EEPROM error - -
M8002
Error status of 3rd analog special adapte
r
b6 = OFF (hardware error)
Error status of 3rd analog status register
b7 = OFF (communication data error)
RST M6
RST M7
Initial pulse
MOV
D8288 K4M0
M8000
Normally ON
MOV
D8288K4M0
*1
*1
M8002
Error status of 1st analog special adapte
r
b6 = OFF (hardware error)
Error status of 1st analog status register
b7 = OFF (communication data error)
RST D8268.6
RST D8268.7
Initial pulse