Siemens G26004-A3118-P800 | Low Voltage PLC Module

The Siemens G26004-A3118-P800 serves as a programmable logic controller module for low voltage systems. This compact unit fits into Siemens LV control cabinets and distribution panels. You can use it for lighting control, building automation, and basic machinery tasks. It handles discrete I/O signals from sensors, pushbuttons, and relays efficiently. Consequently, this module replaces traditional hardwired logic with flexible programmable control.

Technical Specifications Overview

Parameter	Detailed Specification
Model	Siemens G26004-A3118-P800
Category	Low Voltage Products / Programmable Logic Controller Module
Processor	8-bit microcontroller (custom Siemens design)
Program Memory	8 KB Flash (non-volatile, no battery needed)
Data Memory	2 KB RAM (retains data via super capacitor)
Number of Inputs	8 digital (24V DC, sinking/sourcing)
Number of Outputs	6 digital relay outputs (250V AC / 30V DC, 2A)
Input Delay	2 ms (programmable filter)
Output Type	SPST normally open relays (mechanical)
Operating Voltage	24V DC (19.2V to 28.8V)
Power Consumption	100 mA (typical, excluding outputs)
Energy Storage	Super capacitor (holds data for 72 hours)
Dimensions (approx.)	90 mm x 72 mm x 55 mm
Weight	0.18 kg (180 grams)
Housing Material	Polycarbonate (UL94 V-0 rated)
Protection Rating	IP20 (panel mount)
Interface	RS-485 (Modbus RTU, slave only)
Operating Temperature	-10°C to 55°C

Functional Features and Control Capabilities

The Siemens G26004-A3118-P800 executes ladder logic programs for simple automation tasks. You can program this module using Siemens LOGO! Soft Comfort software. The built-in super capacitor preserves runtime data during short power interruptions. Furthermore, the module includes a real-time clock for time-based switching functions.

This controller supports up to 40 function blocks including timers and counters. The LED indicators show input, output, and power status at a glance. Additionally, you can expand the I/O capacity by connecting expansion modules. The relay outputs switch directly to contactors, lamps, and small motors.

Installation and Wiring Guidelines

First, mount the Siemens G26004-A3118-P800 on a standard DIN rail inside your panel. Next, connect the 24V DC power supply to the designated terminals. Then, wire your sensors and pushbuttons to the input terminals. Finally, connect your loads to the relay output contacts (normally open).

You must use external fuses for output circuit protection. The module does not provide short-circuit protection on its relay outputs. Always route low-voltage signal wires separately from AC power cables. Furthermore, verify the load current does not exceed 2A per output channel.

This PLC module works perfectly for lighting schedules and HVAC control. It also suits small conveyor sections and pump control applications. The Siemens G26004-A3118-P800 integrates seamlessly into existing LV distribution boards. You can reprogram the module without removing it from the DIN rail.