128KB 880 Sinumerik PLC Programmable Logic Controller CPU 6FX1138-6BB01

Siemens 6FX1138-6BB01 PLC CPU Module

Overview

The 6FX1138-6BB01 is a Siemens SINUMERIK CPU module. Product listings identify it as SINUMERIK 880 PLC-CPU 135WB/COP with 128 KB RAM and compatibility for software version 4.x. It is categorized under the SINUMERIK family and presented as a CPU rather than as an accessory or passive spare part.

This model belongs to the control core of an installed SINUMERIK 880 environment.

In practical use, a CPU module like this is central to the original numerical control and PLC structure of the machine, so exact model continuity is important when preserving the existing hardware layout and software generation. 

The available product references consistently place it in the CPU class of the SINUMERIK 880 system.

Technical Data

Application Value

This CPU module is relevant to SINUMERIK 880 systems where the installed controller hardware must remain aligned with the original machine architecture.

Its value is strongest in maintenance, service, and replacement work where the machine is already built around the PLC-CPU structure of the SINUMERIK 880 platform.

Because the available references tie this part directly to a specific SINUMERIK 880 CPU function and software generation, it is best used where the existing hardware and software environment are already known.

That makes exact model matching more important than general family similarity.

Selection Notes

The key checks are the exact part number, the SINUMERIK 880 platform, the PLC-CPU 135WB/COP designation, and the software version 4.x context.

These details define whether the CPU matches the installed control structure.

FAQ

Q1: What kind of product is 6FX1138-6BB01?
It is a Siemens SINUMERIK 880 PLC-CPU module. The published product description identifies it specifically as PLC-CPU 135WB/COP with 128 KB RAM, which places it in the control-processor category of the SINUMERIK 880 system.

Q2: Is this an accessory or a CPU?
It is identified as a CPU. The available product references place it in the SINUMERIK family and list it under the CPU category, not as a simple accessory or connector.

That distinction is important because CPU hardware defines the machine’s control core.

Q3: Why is the 128 KB RAM detail important?
Because memory class is part of the CPU’s original hardware profile. The published description for this part includes 128 KB RAM, and that specification helps distinguish it from other control components in the same broader system family.

Q4: Why does the software version reference matter?
The available product description ties this part to software version 4.x. That matters because controller compatibility in installed CNC systems is closely linked to the hardware generation and the software environment the machine was built around.

Q5: What should be checked before ordering?
Check the installed part number, confirm the machine uses SINUMERIK 880, verify the CPU designation 135WB/COP, and confirm the relevant software version 4.x environment. Those are the main matching points for this module.