Mitsubishi Electric MELSEQ FX3S Series User Manual page 110

FX Series Programmable Controllers
3S
User's Manual - Hardware Edition
2. Averaging time
If the averaging time is set in the PLC, the averaged data will be stored as the input data.
The averaging time can be set for each channel.
Set the averaging time in the following special data registers:
Special data register
D8274
D8275
Cautions regarding averaging time setting
• If the averaging time is set to "1", the immediate data is stored to the special data register.
• If the averaging time is set in the range from 2 to 4095, the average value will be calculated to conform to
the set averaging time, and the average value obtained will be stored in the special data register.
• After turning the PLC power on, the current data is stored to special data registers until the number of data
items reaches the set averaging time. After this, the average data will be stored.
• Set the averaging time in the range from 1 to 4095. If the set value is outside the setting range, an error
signal will be output.
• If the averaging time is set to "0" or smaller, the PLC will perform as if the averaging time is set to "1".
If the averaging time is set to "4096" or larger, the PLC will perform as if the averaging time is set to "4096".
3. Error status
If an error is detected in the PLC, 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:
Special data register
D8278
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.
Bit
b0
b1
b2
b3
b4
b5
b6 to b15
4. Model code
When the analog built-in main unit is connected, model code "5" is stored in the corresponding special data
register.
The following table shows the special data registers that store the model code:
Special data register
D8279
104
Averaging time for channel-1
Averaging time for channel-2
→ For a detailed description of the error, refer to Subsection 11.3.10.
Error status
→ For a detailed description of the error status, refer to Subsection 11.3.10.
Channel-1 over-scale detection
Channel-2 over-scale detection
Unused
Unused
EEPROM error
Averaging time setting error (common ch1 and ch2)
Unused
Model code
Description
Description
Description
Description
11 Use of Built-in Analog
11.3 Built-in analog input function