Operating Instructions COMPAX-M / -SProcess coupling using HEDA (Option A1 / A4)1688.6.4 Process coupling using HEDA (Option A1 / A4)See also Page 185.HEDA (SSI interface) can be used for synchronization of several axes withsimultaneous (±2.5 μs) processing of individual controller time slices.The master (operating mode 1) transmits 2 synchronization words to the slaveaxes, enabling them to synchronize. The slave axes (operating mode 2)synchronize automatically. No response is transmitted from the slave axes to themaster.The master only transmits to axis address 1. Therefore, all slaves must also be setto address 1 (P250=1).Acyclic communication between master and slave is not possible.COMPAX XX00 as slave to transmit "Fast start" or as masterCOMPAX XX60 as master or slave not when P212=3 and P212=4COMPAX XX70 as master or slave only when P31=9 or 0Max. 16 participants in the master/passive slave operating mode and max. 50mcable length.The units must be fitted with the O1 / A4 (COMPAX 1000SL) option. There must bea terminating connector bus 2/01 on the last slave.ParameterNo.Meaning ValidfromDefaultvalueP243 HEDA operating mode VP 0P245* Assgn outputs O1 ... O8 to the HEDA bus imme-diately0P246* Assgn outputs O9 ... O16 to the HEDA bus imme-diately0P247 Max. average transmission errors VP 5P248 Max. transmission errors VP 15P249 Synchronization monitoring VP 10P250 Unit addresses (in master ñ slave mode =1) VP 0*In the HEDA master - HEDA slave operating mode (passive slave to COMPAXmaster), P245=P246=0 is set.No.P243 P250 OperatingmodeDescription0 Notrelevant= 0 Independentsingle axisNo coupling, no synchronization0 0 = 1 ... 9 Slave on IPM 39via HEDACoupled operation and acycliccommunication possible via HEDA1 Bit0="1"(P243=1)= 1 COMPAX asmasterMaster axis transmits synchronousword and 7 words to address 12 Bit1="1"(P243=2)= 1 Passive slaveto COMPAXmasterSlave receives at address 1 (P250=1),but does not send anything backNote!If HEDA coupling is activated and the master executes "Find machine zero",this will result in a positional offset between master and slave.You should therefore execute machine zero travel when the HEDA couplingis deactivated.39 The interpolation module IPM can also be used as a master, but only withCOMPAX XX00; COMPAX XX60, COMPAX XX70Synchronizationand fast start viaHEDA:Variant support:Physical limits:Hardwarerequirements:HEDAparameters:Operating modes:
