Siemens 6ES5488-3LA21 Digital Input/Output Module for SIMATIC S5

The 6ES5488-3LA21 combines digital inputs and outputs in a single S5 module. This mixed I/O unit saves valuable rack space for smaller automation tasks. You can use it for simple machine control or sequencing applications.

Key Technical Parameters

The table below lists all essential technical specifications for this digital input/output module.

Physical Characteristics and Installation

This digital I/O module weighs approximately 0.58 kg for standard rack mounting. Its dimensions measure 250 mm x 25 mm x 210 mm for S5 single-width slots. First, slide the 6ES5488-3LA21 into a free I/O rack position. Then, connect your sensors and actuators to the screw terminals. Finally, secure the module using the top and bottom locking screws. LED indicators on the front show the real-time status of every channel.

Input Specifications and Signal Detection

The 6ES5488-3LA21 provides 16 digital input channels for field sensors. Each channel accepts 24V DC nominal signals from switches and proximity sensors. The module draws only 7 mA per channel for reliable detection. A 3 ms response time captures standard machine events reliably. Optocouplers isolate every input from the internal logic circuits for safety.

Output Specifications and Protection Features

This module delivers 16 transistor outputs for driving small actuators. Each output supplies up to 0.5 A at 24V DC. Built-in short-circuit protection prevents damage during wiring faults. Overload protection shuts down the affected output automatically. The 6ES5488-3LA21 responds to output commands in just 2 ms. The module requires both 5V DC logic power and 24V DC field power for operation.