Siemens G26004-A3118-A: Intelligent Positioning Module

Physical Dimensions and Mounting Details

The Siemens G26004-A3118-A provides precision axis control for motion applications. This module measures 250mm in height, 35mm in width, 160mm in depth. You can mount this unit on a standard 35mm DIN rail inside any control cabinet. The module weighs 0.52 kilograms , requiring careful handling during installation.

Internal Architecture and Component Density

The Siemens G26004-A3118-A contains 178 individual components on its four-layer PCB. A 32-bit motion controller runs positioning algorithms at 40 MHz clock speed. Four quadrature encoder interfaces read position feedback from servo motors. Additionally, eight opto-isolators separate drive signals from the logic circuitry.

Energy Storage and Position Retention

This positioning module stores 18.6 joules across six electrolytic capacitors. This energy reserve maintains target position data for up to 35 milliseconds during power dips. The storage also preserves current position values while the system recovers. Consequently, the module prevents axis drift during brief supply interruptions.

Interface and Connectivity Features

The Siemens G26004-A3118-A provides one 50-pin D-sub connector for motor drive interface. A single 20-pin IDC header links the module to the host backplane. You will also find one 9-pin D-sub connector for encoder feedback signals. Each terminal accepts AWG 24 to AWG 18 shielded cable for noise-sensitive signals.

Motion Control Capabilities

This module generates pulse trains up to 200 kHz for servo or stepper drives. You can select from pulse-direction or CW/CCW output modes as needed. The module performs linear interpolation across one axis with high precision. Furthermore, the unit supports electronic gearing and position camming for complex motions.

Encoder Feedback and Accuracy

The Siemens G26004-A3118-A reads incremental encoder signals at up to 1 MHz input frequency. The internal counter stores 32-bit position values for long travel distances. Consequently, the module achieves a maximum positioning error of ±1 encoder count. You can configure software limit switches to prevent over-travel conditions.

I/O Functions and Control Signals

This positioning module includes 8 digital inputs for limit switches and home sensors. 4 digital outputs provide status signals to external devices. The inputs accept 24V DC signals with 2ms filtering for noise immunity. The outputs source 20mA at 24V DC directly to indicator lamps or relays.

Diagnostic and Status Indication

Seven LED indicators provide immediate feedback for motion and module status. Green PWR confirms the presence of valid backplane power. Amber RUN blinks during active positioning operations. Red ERR lights up for any encoder fault or limit switch violation. Four additional LEDs show drive enable, target reached, home found, and axis error conditions.

Programming and System Integration

You program the Siemens G26004-A3118-A using STEP 5 software on a programming device. The module stores up to 100 motion profiles in its internal flash memory. Each profile can contain acceleration, velocity, and target position parameters. Furthermore, you can execute relative or absolute moves through simple command bits.

Environmental Specifications and Compliance

You can operate this positioning module from 0°C to 55°C ambient temperature without derating. Storage temperature ranges from -20°C to 70°C for long-term preservation. Non-condensing humidity tolerance spans 10% to 95% for industrial environments. This module meets DIN 19240 standards for motion control equipment.