Siemens SINUMERIK 840D Description Of Functions

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11.03 3 Safety-Related Functions3.11 Encoder mounting arrangements© Siemens AG 2003 All Rights ReservedSINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03 3-173The previous history consists of the saved user agreement and the savedstandstill position (refer to "Saved user agreement" and "Saved standstillposition").As described under "Axis safely referenced", a previous history can be used toobtain the axis state "axis safely referenced".The following conditions must be fulfilled:• The saved user agreement must be available.• The difference between the "reference position" (power on position withabsolute measuring systems or reference position with incrementalmeasuring systems) and the saved standstill position (including traversingdistance to reference point with ERN) must be within a tolerance windowspecified via machine data.Axis safelyreferencedEQN: Read absolute value from encoderERN: Approach reference pointAxis statusnot OKCheckPrevioushistorynoCheck OKAxisreferencedyesUser agreement(softkey)Internalcheck ofprevioushistoryAxis notreferencedJUST_01.DSFAxis statusAxis statusInterface signal"Reference point reaced" = "0"SGA"Axis safely referenced"SBH/SGis reliablefrom thisaxis statusCheck of positionInterface signal"Reference point signal" = "1"Axis status is displayed via:SE/SNis reliablefrom thisaxis statusFig. 3-43 Axis states during referencingPrevious history