SIEMENS6FX1122-2AD02Sinumerik 3 NC-to-PLC Coupling Interface Card, 8 MHz

Product Description

What this part is

A Siemens 6FX1122-2AD02 — the NC/PLC coupling module for the Sinumerik 3 CNC control, running at 8 MHz. It is the communications interface between the numerical-control side and the machine PLC side of the control: signals, interlocks and status pass across this card. Functionally it is a coupling / interface board, not an I/O module, not an output module and not a CPU.

Correcting the source data

This is a communications coupling card. Cards of this type are routinely mis-listed as I/O or output modules because they sit in the same rack — the distinction matters, because a coupling card carries no field terminals and drives nothing directly.

Decoding the order code

6FX — Siemens Sinumerik CNC control and interface hardware1122 — the NC/PLC coupling board group2AD02 — the 8 MHz Sinumerik 3 configuration; the leading digit denotes the hardware generation and the AD group the coupling variant

Published specifications

Type: NC to PLC coupling / interface module (plug-in card)Control platform: Siemens Sinumerik 3Clock: 8 MHzFunction: data link between the numerical control and the machine PLCForm: plug-in card in the Sinumerik control rackOrigin: Germany (Siemens nameplate)

What these specs mean in practice

When this coupling fails, the symptom is a control that powers up and shows a screen but will not talk to the machine: interlocks stay unsatisfied, the machine will not enable and PLC status looks dead from the NC side. That is a different fault picture from an I/O card failure, which affects specific signals rather than the whole exchange. The 8 MHz rating is part of the identity — slower and faster variants of the coupling exist and are matched to the control’s CPU generation.

Installation and setup notes

Fit in the same rack slot as the outgoing card, and match the full order number: Siemens supplied several coupling variants under the 6FX1122 group and the 2AD02 and 2AM02 versions in particular are the subject of long-running substitution questions — treat them as different parts unless your machine documentation says otherwise. Static-sensitive; handle by the edges and reseat squarely.

What is not included

Card only. No Sinumerik rack, card cage or control cabinet, no CPU or memory cards, no PLC modules or I/O cards, no power supply, no operator panel, no ribbon or signal cables, no connector kits or terminal boards, no software or ladder program and no documentation.

Quantity and configuration

Sold as one card.

Interchange guidance

6FX1122-2AD02, 6FX11222AD02 and 6FX1 122-2AD02 are the same card. 6FX1122-1AD02 is an earlier generation of the same coupling function and 6FX1122-2AM02 a related variant — both are different parts, not confirmed equivalents. Sinumerik 3 cards do not fit Sinumerik 800 / 8 series or Sinumerik 840 racks.