SIEMENS · SIMATIC
Migration background and scope of application
S7-1200 G2 is Siemens' platform for a new generation of compact automation applications. For devices that have installed S7-1200 G1, the replacement cannot only look at short names such as "CPU 1214C"; the complete MLFB, power supply mode, output type, onboard I/O, expansion module, communications interface and TIA Portal project version need to be confirmed at the same time.
Use these part numbers to identify legacy equipment and evaluate migration paths. Before ordering, verify the complete ordering code, nameplate, motor or load conditions, existing wiring and required site functions.
Common legacy part numbers and successor models
| legacy model / Legacy | original product description | Successor / Replacement direction | replacement notes |
|---|---|---|---|
| 6ES7214-1AG40-0XB0 | CPU 1214C, G1 | 6ES7214-1AH50-0XB0 | G2 corresponding direction; check I/O and engineering version |
| 6ES7214-1BG40-0XB0 | CPU 1214C, G1 | 6ES7214-1BH50-0XB0 | Check power supply/output type |
| 6ES7214-1HG40-0XB0 | CPU 1214C, G1 | 6ES7214-1HH50-0XB0 | Check onboard I/O and expansion |
| 6ES7233-4PH32-0XB0 | G1 mixed analog module | 6ES7233-4HF50-0XB0 | G2 module functions/channel configurations are different and require engineering verification. |
What needs to be checked before replacement
Procurement and migration advice
If the legacy part number still has reliable inventory, the purchase of spare parts for the original model can be evaluated first; if the equipment still needs to be operated for a long time, the successor platform should be evaluated simultaneously. For discontinued parts, the real risk is often not "will the new model start?" but rather whether the wiring, communications, software engineering, mounting dimensions, or whether a legacy option will still meet field requirements after migration.
When sending an inquiry, it is recommended to also provide the complete part number, quantity, photo of the equipment nameplate, site voltage/motor parameters, and whether successor models are accepted. In this way, "original model inventory" and "successor model migration" can be compared together as two sets of plans.
Frequently Asked Questions
Can S7-1200 G1 be directly replaced by G2?
It cannot be replaced directly by default. Power supply, output mode, onboard I/O, expansion modules and TIA Portal project compatibility should be checked first according to the complete MLFB.
Can CPU 1214C G1 and G2 be interchangeable if they have the same name?
No. The same short name does not mean that the hardware is completely identical. Procurement and migration should be based on the complete ordering code.
Can older programs be downloaded directly to G2?
Hardware migration and engineering checks are usually required in the supported TIA Portal version. I/O addresses, modules and technology objects should also be reviewed.
What is the best thing to provide when enquiring?
Providing a complete MLFB of the old CPU, a list of expansion modules, a photo of the device and the current TIA Portal version significantly reduces the risk of wrong selection.
Need to check for a specific legacy part number?
By sending the complete part number, nameplate or BOM, we can confirm the availability of the original model before determining whether a successor model is needed.
