Parameters and firmware blocks247Group 68 SYNC REF MODSynchronisation reference modification settings that are used to select betweenabsolute or relative synchronisation, to set an electrical gear ratio between thesynchronisation reference and the drive positioning system, and to filter thereference.68Firmware block:SYNC REF MOD(68)This block• selects the source for the synchronreference chain• defines the gear ratio and selects ascaling factor for the ratio (insynchron control the positionreference is first multiplied with thedefined gear ratio and then with thedefined gear scaling factor)• defines the synchron speedreference filter time• defines the maximum positiondifference between the unfilteredand filtered synchron speedreference• selects the synchronisation of thefollower drive in synchron controlmode• shows the position reference insynchron control mode.Block outputs located in otherparameter groups4.16 SYNC REF GEARED (page 104)68.01 SYNC GEAR IN FW block: SYNC REF MOD (see above)Selects the source for the synchron reference chain. The default value is P.4.15, ie, parameter 4.15SYNC REF UNGEAR, which is the output of the SYNC REF SEL firmware block (on page 244).Value pointer: Group and index68.04 SYNC GEAR ADD68.02 SYNC GEAR MUL68.03 SYNC GEAR DIV68.05 SYNC REF FTIME68.06 SYNCFILT DLY LIMddt ³ dt 4.16 SYNC REF GEARED68.01 SYNC GEAR IN x68.07 SYNCHRON MODExySYNC REF MOD 13TLF5 500 μsec (2)< 68.01 SYNC GEAR IN[ SYNC REF UNGEAR ](10 / 4.15)68.02 SYNC GEAR MUL[ 1 ]68.03 SYNC GEAR DIV[ 1 ]68.04 SYNC GEAR ADD[ 1.000 ]68.05 SYNC REF FTIME[ 0 ms ]68.06 SYNCFILT DLY LIM[ 0.000 rev ]68.07 SYNCHRON MODE[ Relative ]4.16 SYNC REF GEARED