Example: Read Drive Data - Siemens SINUMERIK 840D sl Function Manual

Extended functions

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Example: Read drive data

A system contains two NCUs (NCU1/NCU2). The NCUs are connected via the NCU link. The

MA2 machine axis of NCU1 (drive 2) travels in interpolation mode as link axis for NCU2. The

actual current value of drive 2 should be transferred for evaluation from NCU1 to NCU2. The

figure below shows the basic design of the system.

The actual current value for drive 2 (NCU1/MA2) can be read via the $VA_CURR system

variable. In the case of PROFIdrive-based drives, the following machine data item needs to

be set for this purpose:

MD36730 $MA_DRIVE_SIGNAL_TRACKING = 1 (acquisition of additional actual drive values)

Setting the machine data makes the following drive actual values available:

● $AA_LOAD, $VA_LOAD (drive capacity utilization in %)

● $AA_POWER, $VA_POWER (drive active power in W)

● $AA_TORQUE, $VA_TORQUE (drive torque setpoint in Nm)

● $AA_CURR, $VA_CURR (actual current value of axis or spindle in A)

Extended Functions

Function Manual, 10/2015, 6FC5397-1BP40-5BA3

B3: Distributed systems - 840D sl only

3.2 NCU link

Sinumerik 828d