Siemens 6ES5281-4UA11 Counter Module

Technical Overview

The Siemens 6ES5281-4UA11 is a dual-channel counter module for the SIMATIC S5-100U programmable controller series. This unit counts and processes high-speed pulses from incremental encoders or proximity switches. It supports two independent counting channels, each handling frequencies up to 10 kHz. The module integrates a digital input for gate control and a digital output for switching thresholds. A DIP switch on the front panel facilitates quick configuration of operating modes.

Technical Specifications

Parameter	Specification
Manufacturer	Siemens
Model Number	6ES5281-4UA11
Product Type	Counter Module
System Compatibility	SIMATIC S5-100U
Number of Channels	2
Maximum Count Frequency	10 kHz
Counting Range	0 to 9999 (BCD)
Counting Modes	Up/Down, Pulse, Frequency
Input Signals	24 VDC (encoder or pulse)
Gate Input	1 (24 VDC)
Digital Output	1 (switching threshold)
Configuration	DIP switch
Power Consumption	2 W
Dimensions	233 x 37 x 268 mm
Weight	0.4 kg
Operating Temperature	0°C to +60°C
Storage Temperature	-40°C to +85°C
Certifications	CE, UL, CSA
Country of Origin	Germany

Key Features

Dual-Channel Counting – The module processes two independent pulse trains simultaneously for efficient monitoring.

High-Speed Operation – The 10 kHz frequency capability supports demanding motion control applications.

Versatile Counting Modes – Users can select up/down, pulse, or frequency counting modes for flexibility.

Integrated Gate Input – The gate function enables external start/stop control of the counting process.

Threshold Output – The digital output triggers when the count reaches a preset value.

Applications

The Siemens 6ES5281-4UA11 excels in position monitoring, speed measurement, and length counting. It is ideal for conveyor systems, packaging lines, and material handling applications.