Siemens 6ES5440-8MA12 – Digital Output Module for SIMATIC S5 Actuators

The Siemens 6ES5440-8MA12 drives solenoids, contactors, and indicator lamps in automation systems. This output module measures 250 mm in depth and 25 mm in width. It fits standard SIMATIC S5 rack slots without any modifications. The unit weighs 0.45 kg, making installation quick and straightforward.

Channel Configuration and Output Specifications

This digital output module provides 16 independent output channels on its front panel. The Siemens 6ES5440-8MA12 switches loads from 24V DC up to 60V DC. Each channel handles 0.5 amps of continuous current without external cooling. The total current across all channels must not exceed 4 amps. Each output includes a flyback diode for inductive load protection.

Switching Technology and Response Time

The module uses power MOSFET transistors for fast and reliable switching operations. The Siemens 6ES5440-8MA12 turns outputs on within 50 microseconds of receiving a command. It turns outputs off within 40 microseconds for precise load control. Each channel includes short-circuit protection with automatic current limiting. Thermal shutdown protects the module during overload conditions.

Internal Architecture and Component Layout

The module contains two separate circuit boards inside its plastic housing. One board handles logic interfacing, while the other manages output switching. The Siemens 6ES5440-8MA12 includes 16 LED indicators for individual channel status. A 48-pin edge connector interfaces with the S5 backplane for power and data. The module stores 68 µF of capacitance for output filtering only.

Power Requirements and Environmental Tolerance

The Siemens 6ES5440-8MA12 draws 80 mA at 5V DC from the backplane supply. It requires external 24V DC power for the output circuits. The module operates reliably from 0°C to 60°C ambient temperature. It tolerates humidity levels up to 95 percent without any condensation issues. The unit withstands vibration up to 2g from 10 to 500 Hz.

Below is a complete summary of its technical specifications.

The Siemens 6ES5440-8MA12 replaces older output modules in SIMATIC S5 systems. You do not need any rewiring or configuration changes during replacement. This module also supports hot-swapping in compatible rack configurations. Consequently, it controls actuators reliably in packaging lines and material handling systems.