Siemens SINUMERIK 840D Function Manual

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MD30242 $MA_ENC_IS_INDEPENDENT[ n, axis ]Encoder is independentSystem Value Meaning0 The encoder is not independent.1 The encoder is independent.If the actual-value corrections, which are made for the encoder selected for theposition control, are not to influence the actual value of the second encoderdefined in the same axis, then this should be declared as independent.Actual value corrections are:● - Modulo treatment● - Reference point approach● - Measuring system alignment● - PRESETExample: One axis, two encoders, the 2nd encoder is independentMD30200 $MA_NUM_ENCS[ AX1 ] = 2MD30242 $MA_ENC_IS_INDEPENDENT[ 0, AX1 ] = 0MD30242 $MA_ENC_IS_INDEPENDENT[ 1, AX1 ] = 1Selection, position measuring system 1 / 2: DB31.DBX1.5 / 1.6If encoder 1 is selected for closed-loop position control, then the actual valuecorrections are only performed on this encoder, as encoder 2 is independent.If encoder 2 is selected for position control, then the actual value corrections areperformed on both encoders, as encoder 1 is not independent.This means that the machine data only has an effect on the passive encoder ofa machine axis.2 The passive encoder is dependent.The actual encoder value is changed by the active encoder. In combination withMD35102 $MA_REFP_SYNC_ENCS = 1, for reference point approach, the pas‐sive encoder is aligned to the active encoder - but is NOT referenced.In the referencing mode MD34200 $MA_ENC_REFP_MODE = 3 (distance-co‐ded reference marks) the passive encoder is automatically referenced with thenext traversing motion after passing the zero mark distance. This is done inde‐pendent of the actual operating mode setting.3 The encoder is independent.For modulo rotary axes, modulo actual value corrections are also performed inthe passive encoder.G2: Velocities, setpoint / actual value systems, closed-loop control2.4 Setpoint/actual-value systemAxes and spindles54 Function Manual, 06/2019, A5E47437747B AA