COMPACT CPU 6ES7212-1AE40-0XB0 6ES7 212-1AE40-0XB0 6ES7212-1AE4O-OXBO

Siemens 6ES7212-1AE40-0XB0 SIMATIC S7-1200 CPU 1212C

Overview

The 6ES7212-1AE40-0XB0 is a SIMATIC S7-1200 CPU 1212C compact PLC in the DC/DC/DC version. Siemens identifies this model with 8 digital inputs at 24 V DC, 6 digital outputs at 24 V DC, 2 analog inputs at 0 to 10 V DC, a 24 V DC supply with a 20.4 to 28.8 V permissible range, and 100 KB program/data memory.

Siemens also lists firmware V4.7 and engineering with STEP 7 V20 or higher for this exact CPU.

This controller is designed for compact automation tasks where logic control, local digital I/O, and a small amount of analog signal handling must be integrated in one CPU body.

Its onboard I/O mix makes it well suited to panels where the controller has to manage sensors, switching signals, and basic analog values without immediately depending on additional signal modules. 

The published hardware profile places it clearly in the compact S7-1200 controller range rather than in a distributed I/O or communication-only role.

Technical Data

Application Value

This CPU fits compact machine control, small automation panels, conveying and handling systems, utility control boxes, and other installations where a central PLC must combine local digital control with a limited number of analog measurements.

Because it already includes onboard digital and analog channels, it works well in projects that need a compact hardware footprint while still keeping the main control logic inside a current S7-1200 platform.

For replacement work, using the same CPU model helps preserve the original onboard I/O layout, the DC supply class, and the project target platform.

In compact PLC systems, those points matter directly because the controller body often defines the cabinet wiring, the basic channel count, and the original engineering environment.

Selection Notes

The key checks are the CPU 1212C designation, the DC/DC/DC hardware version, the 8 DI / 6 DO / 2 AI onboard I/O structure, and the 24 V DC supply range. These points define whether the CPU matches the installed control concept and the original panel wiring.

FAQ

Q1: What kind of controller is 6ES7212-1AE40-0XB0?
It is a SIMATIC S7-1200 CPU 1212C compact PLC. Siemens lists it as a DC/DC/DC model with integrated digital and analog I/O, so it is a complete CPU for compact automation rather than an expansion or communication module.

The published configuration for this exact part is 8 DI, 6 DO, and 2 AI.

Q2: Why is the DC/DC/DC version important?
Because that hardware version defines how the CPU is powered and how its onboard I/O behaves. This model uses 24 V DC supply, has 24 V DC digital inputs, and 24 V DC digital outputs.

In replacement work, keeping the same hardware version helps preserve the original cabinet supply structure and output wiring method.

Q3: What does the onboard analog input capability add?
The two 0 to 10 V DC analog inputs allow the controller to process basic analog signals directly in the CPU. That is valuable in compact systems where only a small number of analog channels is required and there is no need to add a separate analog input module just to read a few process values.

Q4: Is this suitable for current Siemens engineering environments?
Yes. Siemens lists firmware V4.7 and engineering with STEP 7 V20 or higher for this exact CPU.

That makes it a current S7-1200 model rather than an earlier-generation compact controller.

Q5: What should be checked before ordering?
Check the installed part number, confirm the controller is CPU 1212C, verify the system needs the DC/DC/DC version, and make sure the installed application depends on the same onboard I/O structure of 8 digital inputs, 6 digital outputs, and 2 analog inputs.

Those are the main compatibility points for this model.