PROFIBUS networks generally use single-pair RS-485 cabling, usually purple in colour. These cables usually have standard DB9 or M12 connectors. In contrast, PROFINET networks use industrial Ethernet cables, which are generally green in colour. The most common connector for PROFINET is RJ45, although M12 connectors are also used for more demanding environments and BFOC for fibre optic applications.

Technical Comparison

PROFIBUS networks, based on RS-485, can achieve speeds of up to 12 Mbit/s, although most operate at 1.5 Mbit/s. The maximum message size is 244 bytes and up to 126 devices can be connected per network. PROFINET networks, on the other hand, can reach speeds of 100 Mbit/s or even 1 Gbit/s and higher. The user message size can be up to 1440 bytes, and there is no limit to the number of devices that can be connected, although individual controllers may have restrictions based on their processor and memory. The total size could be calculated:

•                    Without VLAN and with IPv4:

o   14 (Ethernet) + 20 (IPv4) + 8 (UDP) + 60 (approximate PROFINET) + 1440 (user data) = 1542 bytes.

•                    With VLAN and IPv6:

o   14 (Ethernet) + 4 (VLAN) + 40 (IPv6) + 8 (UDP) + 60 (approximate PROFINET) + 1440 (user data) = 1566 bytes.

The change from RS-485 to Ethernet represents a move towards more modern technology. PROFINET uses standard Ethernet, making it "future-proof". As Ethernet technology advances, PROFINET benefits from these improvements. For example, when PROFINET started, the maximum speed of Ethernet was 100 Mbit/s. Now, PROFINET can work seamlessly with gigabit Ethernet and higher. Ethernet offers many advantages, such as higher bandwidth, larger messages and the ability to connect an unlimited number of devices.

Data Exchange

Another key difference between PROFIBUS and PROFINET is how they exchange data. PROFIBUS uses a master-slave model, while PROFINET uses a provider-consumer model.

In the PROFIBUS master-slave model, the master has full control over the slave devices and processes. The controller is always the master and the input/output (I/O) devices are always the slaves. The supplier-consumer model is more flexible. In PROFINET networks, both controllers and I/O devices can act as providers and consumers, taking advantage of Ethernet's ability to send and receive data simultaneously. The controller sends output data to the I/O devices in its role as provider and receives input data from these devices. I/O devices produce input data and consume output data.

At EPELSA, we have added the Tigris E and Tigris C indicators to our product portfolio, offering options for both PROFIBUS and PROFINET, thus adapting to the needs of various industrial applications.

Features of Tigris Scopes

Tigris C: Equipped with a blue LCD display and PROFIBUS or PROFINET connectivity options, it is ideal for applications requiring flexibility in communication.

Tigris E: Features a red LED display, designed for applications where simplicity and efficiency are crucial.

Tigris indicators are versatile and can be wall or column mounted, adapting to different weighing and process control needs. They are ideal for standard weighing, accumulation, ticket printing, animal weighing and other applications.