WECON PLC Module LX2N-4DA

Caution regarding operation

1. Check whether the output wiring and/or expansion cables are properly connected on LX2N-4DA analog special function block.

2. Check that the LX2N system configuration rules have not been broken, i.e. the number of blocks does not exceed 8 and the total system I/O is equal or less than 256 I/O.Ž

3. Ensure that the correct output mode has been selected for the application.

4. Check that there is no power overload on either the 5V or 24V power source, remember the loading on the LX2N MPU or a powered extension unit varies according to the number of extension blocks or special function blocks connected.

5. Put the main processing unit into RUN.

6. After turning on or off the 24 VDC power for analog signals, the analog output may fluctuate for approximately 1 second. This is due to time delays in the power supply from the MPU or differences in start time. For this reason,be sure to take preventive measures so that this output fluctuation will not affect the external units.

Troubleshooting

If the LX2N-4DA does not operate properly, check the following items:

1. Check the external wiring. Refer to section 3 of this manual.

2. Check status of the POWER indicator lamp (LED) of the LX2N-4DA.

On: The extension cable is properly connected.

Off or flash : Check connection of extension cable. Also check the 5 V power supply capacity.

3. Check status of the 24 V power indicator lamp (LED) of the LX2N-4DA.

On : 24 VDC is supplied.

Off : Supply 24 VDC (+10%) to the LX2N-4DA.

4. Check the status of the D/A conversion indicator lamp (LED) of the LX2N-4DA.

Flash: D/A conversion is normal.

On or off : The ambient conditions are not suitable for the LX2N-4DA, or the LX2N-4DA is defective.

5. Check that the external load resistance connected to each analog output terminal does not exceed the capacity of the LX2N-4DA drive (voltage output: 2kΩ to 1 MΩ / current output: 500Ω ).‘

6. Check the output voltage or current value using a voltmeter or ammeter, and confirm that the output meets the I/O characteristics. If the output does not meet the I/O characteristics, adjust the offset and gain again. Refer to section 8.