Continuous material encoder on X8 in parallel to the resolver

Question:

Under what circumstances can a continuous material encoder be evaluated in parallel to the resolver on S7 without any additional extension module master frequency?

Answer:

The parallel evaluation of a continuous material encoder can be executed via the second encoder interface X8, provided that the application requires no phase -/ position control. The drive movement is executed in torque or open-loop speed control  with the basic functions LS_SpeedFollower or LS_TorqueFollower. The basic functions LS_Positioner, LS_PositionFollower, LS_ManualJog or LS_Homing are not allowed to be applied for the motion control, since they would automatically activate a phase-/position control.

The following parameter settings are required:

• Set-up position control C02570 = 2 (position controller is activated)
• Number of encoder pulses per revolution  C00420
• Encoder type  C00422
• Encoder voltage  C00421

 Then the speed signal and the position of the continuous material encoder will be available at the LS_Feedback.

• Encoder-speed -> FDB_dnActualSpeed_s
• Encoder position -> FDB_dnActualPos_p

In this case the setting C02570 = 2 (position controller activated) does not mean the activation of a position control but only the separation of the signals from the motor encoder and the position encoder.