Drive: S120 Cu310-2PN V5.2
CPU: CPU 1512SP-1 PN V2.9

Trying to get Telegram 750 working to be able to read Torque values from the drive.

Setting everyting up with telegram 105 and 390 it works well. We can run the motor from the commissioning pages both under the Driveunit/DriveAxis and CPU/Technology object.

Problem starts when we add telegram 750 for torque.

First we add telegram 750 under the Drive control (s120 CU310-2pn) "Add supplementary torque telegram".

Next we open the technology object configuration. Under Data exchange with drive - Additional data we check the checkbox "Torque Data" and select the telegram 750 in the box Additional telegram.

After this everything compiles and downloads without problems.
But we can no longer run the motor from the commissioning pages.

What are we missing/doing wrong?   

Have you also downloaded the new drive configuration with the new telegram setting to the drive? Just asking because you just wrote about compiling and downloading the PLC program.

If yes, I would say your way is completely fine and should work.