The easy way to interface SIMATIC controls to multi-vendor systems.

MODBUS is an open protocol used around the world and supported by many different manufacturers. Along with MODBUS, MODBUS/TCP was developed for use in modern networks. This protocol now ranks as an open Internet draft standard introduced to IETF, the Internet Engineering Task Force responsible for Internet standardization.
As a result, manufacturers and users everywhere are free to implement this open protocol, and many leading manufacturers have already taken advantage of this opportunity.

Networking SIMATIC S7 to other systems via MODBUS Industrial Ethernet is a very attractive option, especially when SIMATIC S7 automation systems are being used to expand or modernize legacy configurations or controllers and systems from multiple vendors are being networked.

Different MODBUS software products are available

  • MODBUS/TCP block for CPs
    This MODBUS version is applicable to SIMATIC S7 300 and 400 PLCs. A CP343-1 or CP443-1 is required for the MODBUS communication.

  • MODBUS/TCP block for CPs with redundancy functionality
    This MODBUS version is applicable to SIMATIC S7 400H systems. A CP443-1 is required for every subsystem for the MODBUS communication. A single S7-400 or S7-300 CPU with 2 CPs can also be employed.

  • MODBUS/TCP block for PN PLCs
    This MODBUS version is applicable to SIMATIC S7 PN PLCs and ET200S PN PLCs. In this case, the integrated PN-interface is used for the MODBUS communication.

  • MODBUS/TCP block for PN PLCs with redundancy functionality
    This MODBUS version is applicable to SIMATIC S7 PN-H PLCs. In this case, the integrated PN-interface is used for the MODBUS communication.

  • MODBUS/TCP block for reading data from SENTRON PAC devices
    This MODBUS version is applicable to SIMATIC S7 PN PLCs and ET 200S PN PLCs. In this case, the integrated PN-interface is used for the MODBUS communication. It is possible to read out predefined values of a large number of PAC 3200 and PAC 4200 devices


Area of application

With the increasing popularity of Ethernet communications in both industry and offices, MODBUS/TCP is enjoying an increasingly broad use in all industries. In particular heterogeneous system landscapes are typical areas of application.

Benefits

  • Multi-vendor systems can be easily linked to SIMATIC S7 by Industrial Ethernet

  • Step-by-step expansion or modernization of legacy systems with the latest SIMATIC technology is highly cost-effective

  • You can rely on dependable, Siemens-quality support

  • Using the MODBUS function block requires no specific expertise You benefit from the familiar look and feel of SIMATIC engineering of STEP 7 and PCS 7

  • For some oft the Modbus/TCP products configuration is supported by a wizard


Easy configuration

The configuration is carried out with the standard tool SIMATIC STEP 7. For the MODBUS blocks for the PN PLCs, there are the additional options of a Wizard which provides the possibility of a very fast and comfortable configuration

Licensing

  • The function blocks have to be licensed for each CPU

  • The license is bound to the CPU, transferring the license to a different CPU is not possible.

  • For testing there is no license required

Software/License

Article No.

SIMATIC Modbus/TCP CP for CP 343-1/443-1

SIMATIC Modbus/TCP PN for PROFINET CPUs

SIMATIC Modbus/TCP PN for SENTRON PAC 3200/4200