Siemens 6FX1122-1AC02 PLC Card (Interface Module)

The Siemens 6FX1122-1AC02 is a specialized PLC card primarily used within Sinumerik CNC control systems and SIMATIC S7-300 series I/O expansions. It serves as a signal interface between the CPU and external devices such as encoders, drives, or remote I/O stations.

Functional Overview

This module provides digital input/output signal conditioning with electrical isolation. It is part of the 6FX1122 family of interface components designed for harsh industrial environments. The card plugs into a standard backplane or directly into a Siemens industrial PC slot (ISA or proprietary connector depending on revision).

Electrical Specifications

Isolation and Protection

Optical isolation between backplane logic and field I/O: 1500VAC for 1 minute. Each group of 4 channels shares a common potential. Status LEDs for each input and output indicate active signals. Reverse polarity protection on 24V field supply.

Physical and Environmental Data

• Dimensions: 100mm x 70mm x 15mm (approx.)

• Weight: 0.12kg

• Operating temperature: 0°C to 60°C

• Storage temperature: -40°C to 85°C

• Relative humidity: 5% to 95% non-condensing

• Conformal coating: Yes (standard for industrial use)

Compatibility and System Integration

The 6FX1122-1AC02 is compatible with Sinumerik 810D, 840D sl, and SIMATIC S7-300 PLCs using a dedicated interface cable (6FX8002 series). It is addressed via STEP 7 hardware configuration as a standard I/O module. Typical applications include connecting pushbuttons, limit switches, solenoid valves, and indicator lights to the CNC/PLC system.

Diagnostics and Maintenance

Onboard diagnostics include green RUN LED and red ERROR LED. Fault codes can be read via Siemens diagnostic buffer. The card supports hot swapping when used with an appropriate backplane (not all systems support this). Replacement without power-down is allowed only in systems with passive backplane and proper grounding.

Ordering and Accessories

Order as 6FX1122-1AC02. Comes with 40-pin connector for external wiring (sold separately). Recommended wire gauge: 0.5-1.5mm² (AWG 20-16).