Siemens 6FX1122-2AA02 Multiport PLC Link Module

Siemens 6FX1122-2AA02 is a multiport NC-to-PLC link module that bridges a SINUMERIK 3 CNC controller to a PLC network, operating at a 5 MHz data rate. Built for legacy SINUMERIK 3 installations, this coupling module provides a multiport interface that carries control information between the NC side and the PLC side, enabling coordinated operation of machine tools and PLC-based logic within a single automation scheme. As part of SINUMERIK system wiring, it functions as the dedicated link between the CNC controller and external PLC networks, preserving timing relationships essential for synchronized control across the two domains. The 6FX1122-2AA02 part number identifies a module designed for NC-to-PLC coupling, making it a common choice for spare parts or replacements in older Siemens automation configurations. Typical use involves connecting SINUMERIK 3 hardware to a compatible PLC input/output network so that CNC instructions and PLC logic can exchange signals and data as part of a broader manufacturing cell. This Siemens module exemplifies the historical approach to integrating CNC controls with PLC-based process control, and remains relevant for service and maintenance of legacy SINUMERIK environments that require a reliable link device.