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Copy| Product Name | Siemens 6ES7212-1HE40-0XB0 | SIMATIC S7-1200 CPU 1212C DC/DC/Relay |
| Item NO. | 2927217 |
| Weight | 0.1 kg = 0.2205 lb = 3.5274 oz |
| Category | SIEMENS |
| Brand | SIEMENS |
| Creation Time | 2026-10-26 |
A 24 V DC compact CPU with eight DC inputs, six relay outputs and two analog inputs.
Siemens 6ES7212-1HE40-0XB0 is a SIMATIC S7-1200 CPU 1212C DC/DC/relay controller. It operates from 20.4–28.8 V DC and combines eight 24 V DC inputs, six 2 A relay outputs and two 0–10 V analog inputs in a 90 × 100 × 75 mm housing.
The field circuits around Siemens 6ES7212-1HE40-0XB0 use different electrical paths: the CPU and input electronics require DC power, while each relay output group switches an externally supplied load circuit. This separation must remain clear in the common, fuse and return wiring.
For growth, Siemens 6ES7212-1HE40-0XB0 supports two signal modules, one signal board and three communication modules. Its integrated PROFINET interface provides the controller network path, while the expansion resources add local I/O or communication functions without changing the CPU's onboard terminal map.
| Technical Item | Value |
|---|---|
| Brand | Siemens |
| Model | 6ES7212-1HE40-0XB0 |
| Product Name | SIMATIC S7-1200 CPU 1212C DC/DC/relay |
| Country | Germany |
| Supply Voltage | 20.4–28.8 V DC |
| Digital Inputs | 8 × 24 V DC |
| Digital Outputs | 6 relay outputs, 2 A |
| Analog Inputs | 2 × 0–10 V |
| Program/Data Memory | 100 KB |
| PROFINET Interface | 1 port |
| Signal Modules | 2 |
| Signal Boards | 1 |
| Communication Modules | 3 |
| Dimensions (W × H × D) | 90 × 100 × 75 mm |
Create Siemens 6ES7212-1HE40-0XB0 with its supported firmware in the TIA Portal project and add the installed signal board, communication modules and signal modules in physical order. Confirm the assigned addresses before importing program blocks from another CPU variant.
For each relay command on Siemens 6ES7212-1HE40-0XB0, define the permissives, safe de-energized state and feedback used by the machine sequence. The logic must not assume that a relay contact is a powered transistor output or that opening a contact proves the connected load has stopped.
Assign engineering ranges to the two analog channels of Siemens 6ES7212-1HE40-0XB0 and compare a known field value with the raw CPU count and displayed engineering value. This isolates program scaling from wiring and sensor errors before the value is used for control.
With cabinet power isolated, secure Siemens 6ES7212-1HE40-0XB0 on the DIN rail with ventilation space and a stable protective-earth arrangement. Wire the DC controller supply with the specified polarity and verify the voltage at the CPU terminals under load before attaching field outputs.
Connect the 24 V input commons of Siemens 6ES7212-1HE40-0XB0 according to the field-sensor wiring plan. Feed each relay output group from its intended external load supply, add branch protection, and use suitable suppression on inductive coils so switching transients do not disturb the controller.
Route analog conductors for Siemens 6ES7212-1HE40-0XB0 away from relay and motor wiring, maintain the measurement reference and terminate shields according to the cabinet plan. Restore power with loads controlled, confirm diagnostics and test inputs, relay groups and analog channels individually.
Measure the 24 V DC supply at Siemens 6ES7212-1HE40-0XB0 during the event and include input sensors, attached modules and coil inrush in the calculation. A normal unloaded voltage can hide a supply or conductor drop.
No. The relay contacts of Siemens 6ES7212-1HE40-0XB0 switch an external circuit. Wire the intended load source to the correct relay common and keep the branch protection and return path complete.
A problem common to both channels on Siemens 6ES7212-1HE40-0XB0 points to the reference, shielding, transmitter supply or cable routing. Measure each signal against the correct analog reference at the CPU terminals.
For Siemens 6ES7212-1HE40-0XB0, verify link state, device name, IP parameters and the engineering project's selected CPU. A reachable IP address alone does not confirm the application connection is configured correctly.
Confirm the hardware order, supported module count and power budget for Siemens 6ES7212-1HE40-0XB0. Then update the project before energizing so addresses and diagnostics match the installed chain.
The CPU supply and terminal use differ even when the onboard I/O count is similar. Replacing Siemens 6ES7212-1HE40-0XB0 requires verification of the incoming power circuit, wiring diagram and hardware configuration.
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