Modbus User Manual
■Modbus, originally created by Modicon is a fieldbus that allows a master and one or more slave devices to share data. These data are organized into 16-bit registers, which can also be used to share information single-bit I/O points.
■It is a popular protocol with PLC vendors due to its simplicity and the inherent ease of sending PLC register data (often 16-bits in width) over a fieldbus protocol optimized for 16-bit data.
■The master may initiate read and write operations on single registers or blocks of registers. While there is no rule to this effect, it is common for the master to read and write on a periodic time base (polling), rather than sending and requesting data only when it is needed. In this manner, PLC register data is ensured to be valid and consistent as a representation of the slave device's status.
■The Modbus products of MOONS' are based on
serial communication bus with Modbus/RTU.
■Since Modbus is a master/slave protocol, that means only one node is a master and the others is slave node. Each device intended to communicate using Modbus is given a unique address. In serial networks, only the node assigned as the Master may initiate a command.
■A Modbus command contains the Modbus address of the device it is intended for. Only the intended device will act on the command, even though other devices might receive it (an exception is specific broadcast able commands sent to node 0 which are acted on but not acknowledged). All Modbus commands contain checksum information, to allow the recipient to detect transmission errors. The basic Modbus commands can instruct an RTU to change the value in one of its registers, control or read an I/O port, and command the device to send back one or more values contained in its registers.
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STM Series 、 ST Series 、 STB Series 、 STM 、 STB |
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User's Guide |
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Please see the document for details |
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English Chinese Chinese and English Japanese |
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2015/11/18 |
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397 KB |
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