Siemens SINUMERIK 840D sl Function Manual

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Dwell (sparking out time) and retraction path are programmed under separate addresses inthe block:ST=... Dwell time (for grinding sparking out time)SR=... Retraction pathThese addresses apply non-modally.Axial motionThe axial feedrates are programmed under address FA and remain valid until an input signalis present. They act modally.FMA[2,]=... to FMA[7,]=... can be used to program up to six furtherfeedrates per axis in the block.The first expression in square brackets indicates the bit number of the input that activates thefeedrate when changed. The second expression indicates the axis to which the feedrateapplies.Example:FMA[3,Y]=1000 ; Axial feedrate for Y axis, corresponds to input bit 3The values programmed under FMA act non-modally. The feedrate programmed under FAapplies to the next block.Dwell (sparking out time) and retraction path can also be defined for a single axis:STA[]=... Axial dwell time (sparking out time)SRA[]=... Axial retraction pathThe expression in square brackets indicates the axis for which the sparking out time andretraction path apply.Examples:STA[X]=2.5 ; The sparking out time for the X axis is 2.5 seconds.SRA[X]=3.5 ; The retraction path for the X axis is 3.5 (unit e.g. mm).These addresses apply non-modally.NoteRetraction pathThe unit for the retraction path refers to the current valid unit of measurement (mm or inch).The reverse stroke is always made in the opposite direction to the current motion. SR/SRAalways programs the value for the reverse stroke. No sign is programmed.V1: Feedrates17.4 Feedrate controlBasic FunctionsFunction Manual, 01/2015, 6FC5397-0BP40-5BA2 1345