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What is the modbus register for the parameter Torque 4Q "tqMS" in variable speed drive ATV71?

TQMS is not a parameter, but an affectation possible for AO1 parameter. So there is no direct logical address for TQMS.
 
If you want have the Torque 4Q read by communication, you can read the value of AO1C. 
First of all, you configure in the drive the AO1 = TQMS. Then you can read the AO1 value by communication and use it for master slave. To read AO1 value, read the parameter AO1C (logical address: 5271). 

Example:

If AO1=TQMS and AO1 type  is a 0-10V. When you read :
     AO1C=0 this correspond to -3xCn ( Cn is nominal motor).
     AO1C=5000 this  correspond to 0xCn.
     AO1C=1000 this  correspond to + 3xCn.



If AO1=TQMS and AO1 type is a 0-20mA. When you read :
     AO1C=0 this correspond to -3xCn ( Cn is nominal motor).
     AO1C=10000 this  correspond to 0xCn.
     AO1C=20000 this  correspond to + 3xCn.
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