Circuit Board Siemens Sinumerik System 3 800 Input Output Module 6FX1124-6AD02

6FX1124-6AD02 | Siemens SINUMERIK I/O Submodule — 64 Digital Inputs / 32 Digital Outputs / SINUMERIK 810 / 820 / System 800

6FX1124-6AD02 — Digital I/O for Older-Generation SINUMERIK CNCs

The 6FX1124-6AD02 is a digital I/O submodule for the SINUMERIK CNC control family — specifically the SINUMERIK 3, 810, 820, and System 800 platforms. These are older-generation SINUMERIK CNCs that served machine tools, machining centres, and turning centres from the 1980s through the early 2000s. The 6FX1124-6AD02 provides the machine I/O interface that connects the CNC's internal control logic to the external machine signals.

Key Specifications

64 Inputs and 32 Outputs — CNC Machine I/O

In SINUMERIK-based machine tool control systems, digital I/O modules like the 6FX1124-6AD02 form the physical connection layer between the CNC and the machine tool:

64 digital inputs: Reading the on/off state of discrete machine signals — limit switches on each axis (positive and negative overtravel), reference position switches, door interlock switches, coolant level sensors, hydraulic and pneumatic pressure switches, tool magazine position sensors, and spindle orientation confirmation. At 64 inputs, the 6FX1124-6AD02 provides a substantial I/O count for a complete machining centre's signal collection.

32 digital outputs: Driving discrete machine actuators from the CNC's PMC (Programmable Machine Controller) logic — solenoid valves for coolant, air blow, lubrication, and hydraulic circuits; relay coils for contactor control; indicator lamps; and spindle brake engagement commands.

Application Scenarios

I/O submodule fault in SINUMERIK 810 machining centre: A SINUMERIK 810 CNC machining centre develops I/O faults — the CNC loses multiple machine signals simultaneously, or specific inputs or outputs fail to respond. The 6FX1124-6AD02 is identified as the faulty submodule from the machine's alarm display and I/O diagnostics. Replacement restores correct machine I/O operation.

Planned maintenance: A production facility maintaining older SINUMERIK 3 or 820 CNC equipment keeps 6FX1124-6AD02 as a spare for the specific control system in which it is fitted.

FAQ

Q1: How do I confirm 6FX1124-6AD02 is the correct I/O module for my SINUMERIK CNC?

Read the part number from the installed submodule's label inside the rack. If it reads 6FX1124-6AD02, this is the confirmed replacement. Cross-reference with the machine's electrical drawings and the SINUMERIK maintenance manual to confirm the module's rack position and I/O assignment.

Q2: What is the function of the 3 input connectors on 6FX1124-6AD02?

The three input connectors distribute the 64 digital inputs across three physical connector points — providing a logical grouping of the input signals by machine area or function, and keeping the individual connector sizes manageable. Each connector group carries a portion of the total 64-input count, wired from the specific machine area's signals.

Q3: Does the 6FX1124-6AD02 require configuration or parameterisation after replacement?

The digital I/O assignment for SINUMERIK 3, 810, and 820 CNC systems is defined through the CNC's machine data and PMC ladder programme — not stored in the I/O submodule itself. Replacing the 6FX1124-6AD02 does not require re-entering I/O configuration. After fitting the replacement, verify that each input and output responds correctly through the CNC's I/O diagnostic screen.

Q4: What ESD precautions apply when handling 6FX1124-6AD02?

The SINUMERIK 3/810/820 control cabinet must be powered down before accessing rack-mounted submodules. Handle 6FX1124-6AD02 with a grounded anti-static wrist strap on an ESD-safe surface — older SINUMERIK I/O boards contain CMOS logic devices sensitive to electrostatic discharge. Store in anti-static packaging between removal and installation.