New SIEMENS 6ES7 277-0AA22-0XA0 6ES7 2770AA220XA0 6ES7 277-OAA22-OXAO

Siemens 6ES7277-0AA22-0XA0 PROFIBUS DP Slave Module

Overview

The 6ES7277-0AA22-0XA0 is a SIMATIC S7-200 PROFIBUS DP slave module, commonly known as the EM277.

Siemens’ support and product pages identify it as a PROFIBUS DP Slave Module with one PROFIBUS-DP/MPI interface and communication speeds from 9.6 KB to 12 MB.

Siemens also lists it as a spare part, which clearly places it in the installed-base support category for S7-200 systems rather than in current new-platform standardization.

Technical Data

Application Value

The 6ES7277-0AA22-0XA0 fits well in installed SIMATIC S7-200 automation systems that need PROFIBUS DP slave connectivity to a larger plant network or higher-level Siemens control environment.

In practical use, this module is especially useful where an S7-200 PLC must be integrated into a distributed PROFIBUS structure without redesigning the whole machine around another communications architecture. 

This is an engineering inference based on Siemens’ published DP-slave role and S7-200 family positioning.

Its maintenance value is particularly strong because Siemens now identifies the module as a spare part.

That makes it most relevant to legacy systems, retrofit support, and continuity planning in machines where PROFIBUS remains part of the original control concept.

Replacement and Selection Perspective

For replacement work, the 6ES7277-0AA22-0XA0 should be matched by S7-200 compatibility, DP slave function, interface count, and PROFIBUS architecture, not just by general module appearance.

The key details are that it is an EM277, has one PROFIBUS-DP/MPI interface, and is intended as a DP slave module.

Exact model matching is usually the safest route in legacy S7-200 communication systems.

FAQ

Q1: What kind of module is 6ES7277-0AA22-0XA0?
It is a SIMATIC S7-200 PROFIBUS DP slave module, commonly known as the EM277, used to add PROFIBUS DP slave communication to an S7-200 PLC.

Q2: What applications fit it best?
It fits installed S7-200 systems that need to operate as PROFIBUS DP slaves within a larger industrial network.

This is an engineering inference based on Siemens’ published DP-slave role and the module’s single DP/MPI interface.

Q3: Why is the single DP/MPI interface important?
Because the communications architecture of the machine is built around the available interface count and protocol role.

Knowing that the module provides one DP/MPI interface helps confirm whether it matches the original network design.

Q4: Why does the 9.6 KB to 12 MB data-rate range matter?
Because it defines the communication speed range the module can support on PROFIBUS.

In practical network integration, that helps determine compatibility with the original system’s bus configuration.

Q5: What should be checked before ordering?
Check the installed part number, confirm the machine uses S7-200, verify that the module is needed as a PROFIBUS DP slave, and make sure the original network architecture is built around an EM277 communications module.