2XV9450-1MB02 Siemens SIMATIC MODBUS/TCP PN-CPU Original Brand New

• Software for communication between SIMATIC S7 and devices that support the Modbus/TCP protocol
• Expansion or upgrade of existing plants with SIMATIC automation systems
• Connection of controllers and systems from different manufacturers

• Easy coupling of systems from different manufacturers with SIMATIC automation systems over Industrial Ethernet
• No specialized Modbus know-how required
• Engineering with the standard SIMATIC STEP 7 tool or TIA Portal
• Fast configuration with the help of a wizard or editor

Modbus is a protocol that is widely used internationally, open to all users and supported by many manufacturers. Modbus/TCP was developed from it for use in modern networks. This protocol is now an open Internet draft standard that was introduced by IETF (Internet Engineering Task Force), the organization for Internet standardization. This openness means that every manufacturer and user is able to use this protocol – a possibility that many leading manufacturers have already availed of. The increasing expansion of Ethernet communication into industrial areas as well as the office environment has extended the use of Modbus/TCP in every sector. Heterogeneous system landscapes are the typical areas of use.

Communication with the Modbus/TCP stations is performed via a communications processor (CP) or via the integrated PN interface of the SIMATIC S7 CPU.

A SIMATIC S7 Controller can communicate with more than one Modbus/TCP station simultaneously, depending on the number of connection resources of the S7 CPU.

SIMATIC Modbus/TCP CP and CP Redundant support the following SIMATIC S7 CPs:

• S7 300
  • CP 343-1
• S7 400
  • CP 443-1

Use is possible only on CPs that support the function AG_CNTRL.

SIMATIC Modbus/TCP PN CPU, SIMATIC Modbus/TCP PN Red and SIMATIC Modbus/TCP SENTRON PAC support the following CPUs of the SIMATIC S7:

• ET 200
  • IM 151-8 PN/DP CPU
  • IM 154-8 PN/DP CPU
• S7 300/400
  • CPU 314C-2 PN/DP
  • CPU 315-2 PN/DP
  • CPU 317-2 PN/DP
  • CPU 319-3 PN/DP
  • CPU 412-2 PN
  • CPU 414-3 PN/DP
  • CPU 416-3 PN/DP
• S7-400 H (SIMATIC Modbus/TCP PN CPU and SIMATIC Modbus/TCP PN Red only)
  • CPU 412-5H
  • CPU 414-5H
  • CPU 416-5H
  • CPU 417-5H
  • CPU 410-5H
  • CPU 410-5F
• Soft PLC (SIMATIC Modbus/TCP PN CPU only)
  • SIMATIC WinAC RTX
• SENTRON PAC (for SIMATIC Modbus/TCP SENTRON PAC)
  • PAC 3200, as of FW V2.2.1
  • PAC 4200, as of FW V1.5.1
• SIMATIC Modbus/TCP Red S7-1200/1500 supports the following CPUs
  • S7-1200, as of FW V4.2
  • S7-1500, as of FW V2.5

The Modbus/TCP products have been released for standard CPUs, for F-CPUs, and for (PN)‑(H) CPUs.

The Modbus block functions according to the client/server principle. The client is the active station and the server is the passive station in the communication process. Data is exchanged between the communication partners by means of various different function codes. The S7 can be operated as a client as well as a server during transmission.

A distinction is made between client and server functionality during cyclic operation:

• If the S7 is operating as a client, when a task is activated, a Modbus message frame is generated from the specified current parameters and sent to the coupling partner over the TCP/IP connection. After the response has been received and the data has been checked and found to be consistent, the required actions, such as reading or writing data, will be performed. Any errors that occur during evaluation or processing are indicated on the Modbus block.
• If the S7 is operating as a server, the block waits for a request from the client. If a frame is received from a client, it is checked and evaluated. After the frame has been checked, the response is generated and the required actions, such as reading or writing data, will be performed. A processed request or any errors that have occurred during evaluation are indicated on the Modbus block.