It’s been 11 years of the LOGO! 8 being the standard. And while it’s done a solid job, the world of automation has moved on. The LOGO! 9 is Siemens’ response to the growing demands being placed on compact controllers in building automation, machine building, and light industrial applications.

Here’s what’s changed, what it means for your engineers, and what you need to think about if you’re planning a migration.

What’s new with the LOGO! 9?

The LOGO! 9 is not a minor software update. It’s a full generational change. Siemens has doubled the number of function blocks from 400 to 800, which means engineers can now handle more complex logic applications without needing to step up to a larger PLC platform. For shop-floors where the LOGO! 8 was starting to feel limited, that’s a significant improvement.

The expansion capacity has also increased. The LOGO! 9 supports up to 64 digital inputs, 60 digital outputs, 16 analog inputs, and 16 analog outputs. That’s considerably more headroom for applications that have grown beyond their original scope.

There’s a new AM4 analog expansion module with selectable analog resolution, along with floating-point arithmetic for more precise analog processing. If your engineers are working with temperature control, flow measurement, or any application that requires accurate analog handling, this matters.

A new display and a new way to interact

One of the most visible changes is the built-in colour touch display on the LOGO! 9 basic modules. The LOGO! 8 had a small monochrome screen. The LOGO! 9 replaces it with a colour touchscreen that shows status information, message texts, and diagnostics directly at the device.

There’s also an updated 4.3-inch LOGO! TDE (Text Display External) for applications that need a larger display. Both give engineers faster access to diagnostic information without needing to connect a laptop or open a separate HMI panel.

For maintenance engineers who need to check the status of a controller quickly during fault-finding, this is a practical improvement. Less time connecting cables. More time solving problems.

LOGO! Soft Comfort V9

The engineering software has been updated too. LOGO! Soft Comfort V9 introduces what Siemens is calling “plug and play” cross-platform engineering. It runs on Windows, macOS, and Linux, which gives engineers more flexibility in how and where they work on projects.

If your team is already familiar with LOGO! Soft Comfort from the LOGO! 8 era, the good news is that existing programs can be converted to the new platform using V9. The transition isn’t starting from scratch.

“Equipment and software versions change. We help you stay current.”

Nathan Ramsahai, Tutor, Scantime

Security is now built in

This is a big one. The LOGO! 9 includes Secure Boot and secure LOGO! communication as standard. These features are designed to protect against unauthorised access and unwanted changes to the controller’s program or configuration.

Given the recent wave of cyber attacks targeting industrial control systems, including the April 2026 CISA advisory about state-sponsored hackers disrupting internet-connected PLCs, built-in security is no longer a nice-to-have. It’s essential.

The LOGO! 9 also supports firmware updates through LOGO! Soft Comfort V9 and includes a factory reset function that retains the IP configuration. Both features are designed to make long-term maintenance and security patching more practical for engineers in the field.

The migration: what you need to know

Here’s the part that matters most if you’re currently running LOGO! 8 equipment.

The LOGO! 9 expansion modules are not hardware-compatible with the LOGO! 8 basic modules, and vice versa. If you’re migrating, you’ll need to replace your expansion modules. Communication modules, however, remain compatible, so you won’t need to replace everything.

Some of the new expansion modules are available now. The LOGO! DM8 230R, LOGO! DM8 12/24R, and the new LOGO! AM4 AI/AQ have been available since April 2026. Further modules, including DM8 and DM16 variants, as well as additional analog modules like the AM2 RTD and AM4 AQ, are planned for Q1 2027.

What does this mean in practice? If you’re planning a migration, you’ll need to think about it in stages. The basic modules and some expansion modules are available now, but the full expansion lineup won’t be complete until early next year. Plan your upgrade around what’s available, and factor in the time your team will need to get up to speed with the new hardware and software.

“We’ll encourage you to test things out and play around. If you break things or shut things down here, it’s okay.”

Nathan Ramsahai

Why this matters beyond the spec sheet

A new PLC generation is always more than just a product launch. It’s a training event.

Every time a manufacturer releases new hardware or updates its software, there’s a gap between what the equipment can do and what the engineers working with it actually know. That gap is where downtime lives. It’s where mistakes happen. And it’s where confidence takes a hit.

Human error causes 23% of all unplanned downtime in manufacturing globally (Henkel / Business Wire, 2021). Equipment failures account for approximately 42% of all unplanned downtime, with the average manufacturer facing around 800 hours of downtime per year (Sumitomo Drive Technologies, 2025). Two-thirds of companies experience unplanned downtime at least once per month, at an average cost of $125,000 per hour (ABB, 2024).

When new equipment arrives on the shop-floor and your team hasn’t had the training to work with it confidently, those numbers get worse, not better.

“From the feedback we get we know that even seasoned self-taught engineers will pick up new tips and skills, both from our tutors and from the other people in the room, when they join our courses.”

Nathan Ramsahai

The bigger picture: PLC skills have a shelf life

The LOGO! 9 launch is just one example of a broader trend. Across every major PLC manufacturer, the pace of change is accelerating. Siemens is phasing out the S7-1200 G1 from November 2026. Mitsubishi has launched the MELSEC MX Controller. Schneider Electric is pushing towards software-defined automation. Rockwell Automation has built AI tools into its engineering software.

For maintenance engineers, the message is clear: PLC training isn’t a one-time event. It’s an ongoing investment. The software your engineer trained on 3 years ago may already have been superseded. The hardware they’re confident with today could be phased out next year.

That’s why CPD matters. That’s why refresher courses matter. And that’s why having access to a training environment where you can work with the latest equipment, risk-free, is so valuable.

59% of employees say training programmes directly improve their job performance (SurveyMonkey, cited by Business Management Daily, September 2024). Organisations with a strong learning culture experience 57% higher employee retention (LinkedIn, cited by Bridge LMS, 2024/2025). And proper operator training can prevent up to 12% of equipment failures caused by improper operation and human error (WorkTrek, February 2026).

“Here, you get to try things out and crash a few times, knowing everything will be okay. By the end of the week, you’ll feel more confident, and you’ll know how to fault-find and fix the PLCs on your shop-floors.”

Nathan Ramsahai