Siemens SINUMERIK Series Function Manual

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B3: Distributed systems - 840D sl only2.2 NCU linkExtended FunctionsFunction Manual, 03/2013, 6FC5397-1BP40-3BA1 1192.2.5.2 ParameterizationLink communicationNC-specific machine dataNumber Identifier $MN_ MeaningMD12510 NCU_LINKNO Unique numerical identification of the NCU within the link group. Theidentifiers must be assigned without any gaps in ascending orderingstarting from 1.Value range: 1, 2, ... Maximum NCU numberNote:The NCU to which the value 1 is assigned as NCU identification is themaster NCU of the link group. The parameterization of link axes andaxis containers may only be made with the machine and setting data ofthe master NCU.MD18780 MM_NCU_LINK_MASK.Bit 0 Activation of the link communicationMD18781 NCU_LINK_CONNECTIONS Number of internal link connectionsNote:It is recommended to retain the default value 0 (determination of thenumber by the NC).MD18782 MM_LINK_NUM_OF_MODULES Number of NCUs to be connected with one another via NCU link.Setpoint synchronizationNC-specific machine dataNumber Identifier $MN_ MeaningMD18720 MM_SERVO_FIFO_SIZE Size of the IPO/SERVO data bufferThe transfer of the setpoints of the leading axis via the NCU link to theNCU of the lead-link axis produces a deadtime of two interpolatorcycles. The dead time is compensated by parameterizing the sizes ofthe IPO/SERVO data buffer on the NCU of the leading axis and theNCU of the lead-link axis:• NCU of the leading axis: 4• NCU of the lead-link axis: 2NoteWith the simultaneous use of lead link axes and cross-NCU axis containers, the axiscontainer means machine data MD18720 $MN_MM_SERVO_FIFO_SIZE = 3 must be set.This means a synchronous output of the setpoints for leading and following axis is notpossible. The offset then has the size of one interpolator cycle.