Siemens SINUMERIK 840D Function Manual

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The override factor can be specified from the PLC either in the binary or Gray-coded format.The format is communicated to the NC via the following machine data:MD12000 $MN_OVR_AX_IS_GRAY_CODE (axis feedrate override switch Gray-coded)The following permanent assignment applies to binary code:Binary code Decimal Override factor00000000 0 0.00 ≙ 0%00000001 1 0.01 ≙ 1%00000010 2 0.02 ≙ 2%00000011 3 0.03 ≙ 3%00000100 4 0.04 ≙ 4%... ... ...01100100 100 1.00 ≙ 100%... ... ...11001000 200 2.00 ≙ 200%With Gray coding, the override factors corresponding to the switch position must be entered inthe following machine data:MD12010 $MN_OVR_ FACTOR_AX_ SPEED [] (evaluation of the axis feedrate overrideswitch)Effectiveness of the axis-specific feedrate override:● With active G33, G34, G35: Not effective● With active G63: Not effective(the override is set in the NC permanently to 100%)● With active G331, G332: Not effective(the override is set in the NC permanently to 100%)Spindle overrideAn enable signal and a byte for the spindle override factor are available in the NC/PLC interfacefor each spindle:DB31, ... DBX1.7 (override effective)DB31, ... DBB19 (spindle override)The override factor can be specified from the PLC either in the binary or Gray-coded format.The format is communicated to the NC via the following machine data:MD12060 $MN_OVR_SPIND_IS_GRAY_CODE (spindle override switch Gray-coded)The following permanent assignment applies to binary code:Binary code Decimal Override factor00000000 0 0.00 ≙ 0%00000001 1 0.01 ≙ 1%00000010 2 0.02 ≙ 2%00000011 3 0.03 ≙ 3%V1: Feedrates5.4 Feedrate controlAxes and spindlesFunction Manual, 06/2019, A5E47437747B AA 161