Chen Hong-tu
Abstract
This paper introduces the characteristics of Modbus protocol and the principle of communication between SIEMENS S7-300 PLC and intelligent instrument of Honeywell UDC3500.It presents communication program based on Modbus RTU protocol,and realized intercommunication between S7-300 PLC and intelligent instrument.
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This paper introduces the characteristics of Modbus protocol and the principle of communication between SIEMENS S7-300 PLC and intelligent instrument of Honeywell UDC3500.It presents communication program based on Modbus RTU protocol,and realized intercommunication between S7-300 PLC and intelligent instrument.
Key concepts: Modbus, Siemens, Protocol (science), Embedded system, Communications protocol, Engineering, RS-485, Computer science