SIMATIC S7-1200 G2: 5 Powerful Upgrades You Must See

flowchart LR
    A[S7-1200 G2] --> B[Double Memory]
    A --> C[Motion Control]
    A --> D[Dual PROFINET]
    A --> E[NFC Diagnostics]
    B & C & D & E --> F[Enhanced Automation]

Siemens recently released the SIMATIC S7-1200 G2, a major hardware revision of their compact PLC lineup. After over a decade relying on the original S7-1200, machine builders are now getting features previously reserved for the S7-1500, such as integrated motion control and dual PROFINET ports. However, this upgrade isn’t just a firmware bump—it introduces physical changes that will require you to redesign your control panels and adapt to TIA Portal V20. Let’s look at the five key technical shifts you need to prepare for.

Why the SIMATIC S7-1200 G2 Bridges the Gap to High-End Controllers

The original S7-1200 has been a staple in small-to-medium panels for over ten years. As logic becomes more complex and data logging requirements increase, engineers have frequently hit the memory and performance ceilings of the older CPUs. The SIMATIC S7-1200 G2 pushes these boundaries out. By incorporating doubled memory, built-in kinematic support, and NFC diagnostics, Siemens is effectively pushing S7-1500 capabilities down into a much smaller form factor.

flowchart LR
    direction LR
    subgraph G2 Upgrades
        A[Processing Power] --> B[Complex Logic]
        C[Integrated Motion] --> D[Cost Reduction]
        E[Dual Ports] --> F[Daisy Chain]
    end

1. Doubled Performance and Memory Capacities

Memory bottlenecks are a common frustration when scaling up logic on older CPUs. Siemens addressed this head-on: the SIMATIC S7-1200 G2 CPUs feature a significantly faster execution speed and roughly double the program and data memory across the board.

This is a huge relief if you build complex state machines, manage extensive array data, or implement custom algorithms. You can now avoid the forced upgrade to an S7-1500 just because you ran out of work memory.

2. Integrated High-Performance Motion Control

Previously, basic S7-1200 PLCs handled simple PTO/PWM outputs well, but anything requiring coordinated axes or kinematics forced you into higher-end hardware. The SIMATIC S7-1200 G2 natively integrates advanced motion control. You can now configure single-axis positioning, coordinated axes, and even basic kinematics directly using standard Technology Objects in TIA Portal.

For applications like pick-and-place or packaging, this directly cuts hardware costs by eliminating the need for dedicated motion controllers.

3. Dual PROFINET Ports with IRT Support

All CPUs in the SIMATIC S7-1200 G2 family now ship with dual PROFINET ports as standard. If you frequently design linear topologies, this immediately eliminates the need for external network switches inside the panel.

Beyond simple daisy-chaining, the new controllers support PROFINET IRT (Isochronous Real-Time). You can establish high-speed, synchronized communication with up to 31 PROFINET devices, which is critical for deterministic control in motion applications.

4. Built-in NFC for Power-Off Diagnostics

One of the most practical additions for field maintenance is the integrated NFC chip. Technicians can walk up to a cabinet, tap a smartphone against the CPU housing using the Siemens app, and instantly read the diagnostic buffer or check IP configurations.

The best part? This works even when the PLC is powered off. It completely bypasses the hassle of booting up a laptop and connecting a physical Ethernet cable just to diagnose a dead system.

5. Physical Redesigns and TIA Portal V20 Requirements

This is where the transition gets tricky. To program the SIMATIC S7-1200 G2, you must upgrade to TIA Portal V20 or newer. Furthermore, this is not a drop-in replacement.

The physical housing dimensions have changed—it is 20mm narrower but 25mm taller than the previous generation. More importantly, older signal modules and communication boards are not interchangeable with the G2 series. You will have to redesign your panel layouts and specify all-new I/O cards. Thankfully, TIA Portal provides a Migration Tool that handles the software conversion of your existing code and configurations relatively painlessly.

Planning Your Migration to the S7-1200 G2

Migrating to the G2 generation isn’t an overnight task. You have to account for the physical dimensional differences in your cabinet, source new signal modules, and ensure your engineering team is up to speed with TIA Portal V20.

However, the trade-off is massive. The boost in memory, native motion control, and integrated IRT networking give you a controller capable of handling machines that previously required a much larger hardware budget.

If you’re gearing up for a panel redesign and need network components or interface modules, check out the AutomationView Shop. For the exact mounting dimensions and technical specifications, refer directly to the Siemens Support Portal.