B3: Distributed systems - 840D sl only
2.2 NCU link
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
93
2.2.2.8 Example: Read drive data
Task
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.
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Requirement
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)
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