What are the differences between SIMATIC S7-300 and S7-1500 PLCs?

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Today you will be learning about the differences between the Siemens S7-300 and S7-1500 Advanced series PLCs.

For both systems, a wide range of modules can be used according to the task at hand and a cost-effective stock of spare parts are readily available.

Released in 2012, the SIMATIC S7-1500 is the successor of the longstanding S7-300 PLC.

Although they are interchangeable in many situations, the S7-1500 generation integrates the latest and future-proof technologies into an automation system with enhanced system features over the S7-300.

With the engineering system TIA Portal, the common engineering platform for all SIMATIC controllers, the SIMATIC S7-1500 is designed for fast market changes, constantly shorter product life cycles, and increasing cost pressures.

Both the S7-300 and S7-1500 PLCs are similar in shape and size and are built around a modular, expandable design. CPUs, I/O modules and communication modules may be added as needed to a standard backplane that can be sized to fit your specific project.

Up to 32 expansion modules can be installed with both systems, requiring only a DIN rail mount and backplane.

The S7-1500 has a standard built-in display and keypad that allows for basic configuration and diagnostics without the need for an external screen.

Both the S7-300 and S7-1500 series PLCs have many different configuration options that allow the optimal CPU to be selected depending on the application. Both platforms provide several CPU categories including:

- Standard (for typical applications)
- Compact (for applications where space and cost is a concern)
- Fail-Safe (for fail-safe applications)

The S7-1500 significantly increases performance over the S7-300 with a faster backplane bus, standard PROFINET interface, and shorter reaction times.

As a result, the updated PROFINET interface provides greater reproducibility and precision in the microsecond timeframe.

When programming for slower processes this may not make a noticeable difference in the real world, however, it can be very useful in high-speed applications such as assembly lines.

Two Profinet ports come standard on every S7-1500 CPU although you may select additional ports and communication protocols when ordering.

As an added bonus, you are able to configure these ports as a bridge which acts as a mini switch. This can be very convenient when linking devices and interfacing with the PLC in the field.

With S7-300s, the desired number of ports and appropriate communication protocol must be chosen up-front.

Prices between the S7-300 and S7-1500 are very similar between like models. If cost is a major concern, the S7-1500 compact version provides up to 70% cost savings, as well as 25% space savings compared to the standard CPUs, although some features are limited.

There are several main factors to consider when selecting a PLC for your project. These factors are:

- Application size,
- Available space,
- Communications protocols,
- Processing performance.

By using the Siemens website, you can select the appropriate PLC for your specific application. Here is the link to the PLC selection tool of Siemens:



In conclusion, both the S7-300 and S7-1500 PLCs are capable and proven systems, providing modular, cost-effective, and application-specific solutions to fit your needs.

In the future, Siemens will slowly begin to phase out the S7-300 in favor of the S7-1500.

Eventually, the S7-300s will no longer be supported, although that is still many years away. As of now the added benefits of the S7-1500 offered at a price point similar to the S7-300 make it a no-brainer to go with the updated PLC on your next project.

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Check out this link where you can select the right SIMATIC Controller for your application:



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