Siemens SINUMERIK 840D sl Function Manual

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R3: Extended stop and retract6.3 ESR executed autonomously in the driveSpecial FunctionsFunction Manual, 09/2011, 6FC5397-2BP40-2BA0 389Mapping in the drive unitSystem variable $AN_ESR_TRIGGER is mapped to drive parameter p0890.0.Interconnecting drive parameter p0890.0 with the corresponding information in telegram 390or 391 to the Control Unit is realized automatically when the drive unit commissions the ESRreactions.ReferencesFor a detailed description of drive parameters, refer to:SINAMICS S120/S150 List Manual6.3.7 Feedback of the ESR statusSystem variableThe drive signals back the actual ESR status to the control using the message word(MELDW) of the cyclic PROFIdrive telegram. The status can be read in the control usingsystem variable $AA_ESR_STAT:• $AA_ESR_STAT .Bit2 (ESR is triggered)• $AA_ESR_STAT .Bit3 (DC link undervoltage)• $AA_ESR_STAT .Bit4 (Generator minimum speed)The system variable can be evaluated in the part program/synchronized action, for examplein order to trigger the drive-integrated ESR (see Chapter "Triggering ESR via system variable[Page 388]") or to acknowledge the ESR reactions triggered in the drive "Acknowledge ESRreactions [Page 390]").NC/PLC interfaceThe following signals are used to display the ESR status in the NC/PLC interface.• DB31, … DBX95.0 (VDC link voltage < alarm threshold)• DB31, … DBX95.3 (generator operation minimum speed fallen below)NoteThe trigger signal must be active in the part program/synchronized action for at least 2 IPOcycles to ensure that the PROFIdrive telegram is transferred to the drive.