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V80 and PPC series programmable controllers, MODBUS communication protocol V1.2

2013-09-19
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V80 and PPC series programmable controller MODBUS communication protocol:: This protocol defines the communication message format between the ModBus bus MASTER (master station) and SLAVE (slave station). For the master station, the MODBUS protocol is the interface to the PLC, and all communications are \"transparent\". The MODBUS protocol is the most commonly used PLC communication protocol in the industry, including RTU and ASCII formats. The interpretation of each field of the message in the two formats is the same. The biggest difference between them is the way they perform error checking and the format of characters. 1 MODBUS protocol 21.1 ASCII structure 21.2 REMOTE TERMINAL UNIT (RTU) 21.3 Station address 21.4 Function code 31.5 Data area 31.6 Check code 32 Communication function 5 2.1 Read coil status (Function code 01) - READ OUTPUT 0XXXX STATUS 6 2.2 Read holding register (Function code 03) READ OUTPUT 4XXXX REGISTER 7 2.3 Write a single coil (Function code 05) FORCE SINGLE COIL 0XXX8 2.4 Write a register (Function code 06) - PRESET SINGLE REGISTER 4XXXX.9 2.5 Write multiple coils (Function code 15) - FORCE MULTIPLE COILS 0XXXX9 2.6 Write multiple registers (Function code 16) PRESET MULTIPLE REGISTERS 4XXXX.10

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