Avoid unnecessary and expensive Profinet connections when connecting energy measuring devices to S7 controllers and be able to deliver at short notice

March 2022

Due to current supply bottlenecks on the market, we are increasingly receiving enquiries about connecting our energy meters to S7 control systems. We have been supplying our measuring devices with Modbus TCP interfaces for years. Since alternative suppliers such as Insevis and all new S7 controllers now always have a Modbus TCP-based network connection, connecting the measuring devices is child's play.

To avoid unnecessary Profinet - Profibus connections, PQ PLUS GmbH offers universal drivers for the direct connection of UMD measuring devices to S7 automation devices via Ethernet with Modbus-TCP. Since no control-relevant real-time data is usually generated by the UMD measuring devices, conventional communication is sufficient. This means that there is no need for costly additions. The data is entered directly in data blocks.

The Modbus TCP interface of the UMD Ethernet measuring devices (UMD96EL, UMD97EL, UMD705E....) maps all process data as floating point numbers (32 or 64 bits) in pairs or groups of 4 in input registers. The configuration data is mapped in the holding register. We offer an S7 programme for S7 1200/1500 for this purpose.

For S7-300/400 controllers that have not supported the TCP protocol up to now, we offer a corresponding S7 program (individual and company licence).

You can find the description here:

The FB1 (from the general Modbus-TCP example) serves as a Modbus-TCP client driver module and uses the system modules for sending and receiving via TCP/IP and remains unchanged.

Our measuring devices are available at short notice and have extensive measuring functions.

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