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ads功能块中 idxgrp 这项怎么填?Index-Group/Offset Specification of the TwinCAT ADS system servicesThis section covers those ADS services which have identical meanings and effects with every TwinCAT ADS unit. In this section are also included services to access the PLC process diagram of the physical inputs and outputs.Index-Group/Offset Specification of the PLC servicesThis section includes services to access the PLC memory range (%M field).