System overview1.3 VariantsNCUManual, 07/2007, 6FC5397-0AP10-2BA0 13With the NCU 720.2 PN and NCU 730.2 PN, the SINUMERIK 840D sl is offering integratedPROFINET functionality for the first time.Supported:● PROFINET CBA functionalityThe CBA functionality integrated in the NCU allows users to modularize machinery andsystems: Rapid real-time communication (up to 10 ms) between the controllers meansthat systems lend themselves better to standardization and can be reused or expandedmore easily. Response to customer demands is faster and more flexible and startup issimplified and speeded up by pretesting at component level.● PROFINET IOAs part of PROFINET, PROFINET IO is a communication concept that is used toimplement modular, distributed applications. PROFINET IO is based on IndustrialEthernet and allows distributed field and I/O equipment to be connected to the centralprocessing unit.256 PROFINET IO devices can be operated on the NCU as an IO controller.The typical topology with Industrial Ethernet, illustrated above, can be integrated inexactly the same way using PROFINET IO (or PROFINET components). UsingPROFINET machine control panels or operator panels means, of course, that diagnosticsis available as a PN device.1.3 VariantsThe scalability of the hardware and software – both in the controller and operating area –provides the prerequisites for use of the SINUMERIK 840D sl in many sectors. Thepossibilities range from simple positioning tasks up to complex multi-axis systems.Application areas and performance● As many as 6 axes can be implemented on an NCU 710. The NCU 710 can be expandedby up to 2 NX modules. One possible benefit would be improved servo drive controlperformance.● On the NCU 720/730, the number of axes and/or the performance of the drive controllercan be increased to 31 axes. This is achieved by using the NX10/15 module. The NCU720/730 can be expanded by up to 6 NX10/15 modules in performance for the drivecontroller and number of axes.● Use of an NCU 730 is recommended for maximum dynamics and accuracy in moldmaking or in the high speed cutting sector.● The NCU 730.2 PN is the new flagship of the SINUMERIK 840D sl and, with asignificantly higher PLC capacity than an NCU 730.2, represents the most advancedconfiguration within the SINUMERIK 840D sl range.The following table shows the essential features of the various Control Units: