Ultrasonic sensor 3-wire analog issue

Hi all,



I have a Sick Ultrasonic UP56-213118 sensor which I'm using for continuous liquid level measurement.



I'm using the 2AI 4WIRE module (6ES7 134-4GB11-0AB0) which is in slot 9 on the rack (ET200S). STEP 7 assigns addresses 336 to 339 to the module.



The wires for the sensor are:



L+ brown

M blue

Qa white (analog 4...20mA)

Qpnp black (digital)

Sync/Com green & yellow



I have been unable to get analog input to work correctly (digital working fine).



I have wired the sensor to the module as follows:



Sensor L+ to Module L+

Sensor Qa to Module M+

Sensor M to Module M- and also Module Mana



As per the following diagram: cache.automation.siemens.com/dnl/TA/TAyMTk0OQAA_40913432_FAQ/40913432_S7-1200_SM1234_4-wire_sensor_02.png



I have setup a tag to read Int at %IW336 but when monitor is on I'm just getting zero. There are no diagnostics messages on the module.



Clearly I'm doing something wrong. I've looked at every forum post possible trying to solve it but I don't feel any closer to a solution.



Please help.

Thanks!



I didn't find the right solution from the Internet.



References:
 support.industry.siemens.com/tf/ww/en/posts/ultrasonic-sensor-3-wire-analog-issue/104865/?page=0&pageSize=10

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