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In the current versions the Modbus blocks are encrypted with S7 Block Privacy.
Licenses for the Modbus/TCP block in the S7-300/S7-400.
The blocks that are available for Modbus/TCP communication with SIMATIC S7 are delivered with a unique block number.
Low-Voltage Power Distribution and Electrical Installation Technology, Chapter 15 of LV 10
SENTRON · SIVACON · ALPHA - Protection, Switching, Measuring and Monitoring Devices, Switchboards and Distribution Systems
Application examples for redundant Modbus/TCP communication via the integrated PROFINET interface of the S7-1200 or S7-1500 and a connected CP in STEP 7 V15 or higher.
This entry provides the technical data of the SIMATIC Modbus/TCP blocks and information about the CPUs and CPs for which the SIMATIC Modbus/TCP blocks are released.
You can integrate controllers and systems of numerous manufactures with Modbus/TCP in PCS 7. Siemens provides an application example, in which a redundant Modbus/TCP connection is described completely.
Catalog extract LV 10 • 10/2018
Modbus/TCP product blocks allow communication between S7-CPUs and devices from other manufacturers.
03/2018, Programming Manual, A5E36465068-AC
"SIMATIC Modbus/TCP CP Red" enables redundant Modbus/TCP communication between a SIMATIC (H) controller with CP443-1 or CP343-1 and a third-party device.
With a SIMATIC S7-300 / S7-400 CPU and an external CP 343-1 / CP 443-1 or a CPU with integrated PROFINET interface a communication to a third party device via Modbus/TCP can be realized.
This entry gives you sample applications for Modbus/TCP communication via an Industrial Ethernet CP of S7-300 and S7-400 in the TIA Portal.
This entry gives you sample applications for Modbus/TCP communication via the integrated PROFINET interface of the S7-300 and S7-400 CPUs as well as the IM 151-8 PN/DP CPU in the TIA Portal.
02/2017, Product Information, A5E35040019-AB
"SIMATIC Modbus/TCP CP V6" is now available for delivery. The "SIMATIC Modbus/TCP CP V6" library realizes the communication between a SIMATIC S7 CPU with an Ethernet CP and a third-party device.
"SIMATIC Modbus/TCP PN CPU V3" is now available for delivery. The "SIMATIC Modbus/TCP PN CPU V3" library realizes communication between a SIMATIC S7 CPU with integrated PN interface and a third-party device.
10/2016, Product Information, A5E34480802-AB