Siemens C79458-L2395-A1 | Automation Module

Intelligent Counting Solution for SIMATIC S5 Systems

The 6ES5281-4UP11 measurement counter module, also known as the IP 261, provides intelligent counting capabilities for SIMATIC S5 programmable controllers. This module operates independently of the CPU, ensuring it continues batch measurements even during processor failure. Consequently, this feature proves critical for time-sensitive processes such as batching and continuous measurement tasks. The module’s autonomy makes it indispensable for applications where measurement duration extends over several hours.

Technical Specifications

Parameter	Specification
Manufacturer	Siemens
Product Line	SIMATIC S5
Model	6ES5281-4UP11
Module Type	Measurement Counter Module (IP 261)
Compatible Systems	S5-115U, S5-135U, S5-150U, S5-155U
Digital Inputs	6 inputs + 1 counter input
Digital Outputs	7 outputs (short-circuit proof)
Count Input Frequency	≤ 20 kHz (without filter)
Count Range	232 – 1
Power Supply	24 V DC with redundant option
Current Consumption (5V)	Approx. 50 mA
Dimensions (W x H x D)	200 x 233 x 160 mm
Weight	Approx. 0.2 kg
Operating Temperature (S5-115U)	0°C to 55°C
Operating Temperature (others)	0°C to 60°C
Certifications	CE, UL, CSA

Independent Counting and Measurement Capabilities

The 6ES5281-4UP11 module continues batch measurement automatically even if the programmable controller fails. This autonomy proves essential since measurements can take anywhere from minutes to several hours. The module provides battery-backed memory for all current values and parameters, ensuring no data loss even during complete power failures. Furthermore, the module supports monitoring mode in master/slave operation with two MCs. Users can also select between batch, continuous, and batch master modes, offering flexibility for diverse applications.

Connectivity and Integration

This module connects to the control station via a serial CS (control station) interface. It features isolated digital inputs and outputs for protection against electrical noise. The front panel includes three subminiature D-connectors for the private line, process connections, and serial interface. In addition, plug-in screw terminals handle the 24 V load voltage and redundant power connections. The module also supports a single command channel for straightforward coordination between the CPU and the IP 261.

Physical Characteristics and Installation

The 6ES5281-4UP11 measures 200 mm in width, 233 mm in height, and 160 mm in depth. It occupies a single slot within the S5 rack. The front panel includes LED indicators for displaying operating states. Moreover, users can insert or remove the module while the subrack power remains on. This hot-swap capability significantly reduces system downtime during maintenance. The module’s compact design allows efficient use of rack space.

Application Scenarios and Benefits

This module excels in batching operations where precise measurement is paramount. It also suits industrial applications requiring reliable counting independent of the main CPU. The battery-backed memory protects critical data against power interruptions. The redundant power supply option further enhances system reliability. Consequently, the 6ES5281-4UP11 represents a trusted solution for demanding measurement applications.