Description

Product Overview

The Siemens 6ES7277-0AA22-0XA0, widely recognized as the EM 277, serves as a specialized communications processor for the SIMATIC S7-200 programmable logic controller (PLC) family. This module enables the S7-200 CPU to function as a slave station within a PROFIBUS DP network. By integrating this hardware, engineers establish reliable, high-speed data communication between the S7-200 and higher-level automation systems, such as S7-300 or S7-400 controllers or third-party PROFIBUS masters.

Technical Specifications

• Model Name: EM 277 PROFIBUS DP Slave Module
• Order Number: 6ES7277-0AA22-0XA0
• Communication Protocols: PROFIBUS DP and MPI
• Data Transfer Rates: 9.6 Kbps up to 12 Mbps
• Rated Input Voltage: 24 VDC
• Operating Voltage Range: 20.4 VDC to 28.8 VDC
• Internal Current Consumption: 90 mA (typical)
• Integrated Protection: Current limiting feature (0.7 A to 2.4 A)
• Physical Dimensions: 7.6 cm x 7.6 cm x 10.2 cm
• Net Weight: 0.1 kg
• Country of Origin: Germany

Operational Characteristics and Applications

Engineers deploy this module to extend the connectivity of S7-200 legacy systems. Because the device supports both MPI and PROFIBUS DP protocols, it provides flexibility for programming and networking tasks. The module handles data exchange efficiently, allowing the S7-200 to participate in complex distributed control architectures. Its compact design ensures that it integrates seamlessly into existing control panels where mounting space remains restricted. While this component offers robust performance for industrial automation, users should note that Siemens officially discontinued this model on October 1, 2024. Consequently, system integrators should consult with local representatives to plan for hardware lifecycle transitions or migration strategies.