Modbus TCP Master
- Jongeun Hur (Unlicensed)
Modbus TCP Master(Client)
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Supported devices and requirements |
Β | Description | Notes |
Distributor | MODICON | Β |
Device | MODBUS TCP supported devices | Β |
Comm. Module | Β | Β |
Comm. Type | Ethernet | Β |
Protocol | MODBUS TCP | Β |
Communication Driver | MODICON Modbus TCP(New) | Β |
Communication Settings |
COM BLOCK
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Data Type : Select one of the following types: Coil Status (Digital) / Input Status (Digital) / Holding Register (Analog) / Input Register (Analog)
Data Type | Type | R/W | Identifier | No. of data | Function code |
Coil Status | Digital | Read/Write | 0 | 2000 | 1(5) |
Input Status | Digital | Read Only | 1 | 2000 | 2 |
Input Register | Analog | Read Only | 3 | 125 | 4 |
Holding Register | Analog | Read/Write | 4 | 125 | 3(6) |
Identifier means that the tagβs address in UltimateAccess Web must start with it. For example, using Coil Status and its address 102 means that the address is 00102.
Function code means the MODBUS protocolβs command code used to read the corresponding data type in this I/O driver. The code in the brackets are used to write the corresponding data type.
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Address : After deciding the identifier, designate the starting address of the block. It must be within the range of 1 to 65536.
No. of data : Sets the number of data to read, starting from the address assigned to Address. For digital types, the number of data is always in bits. For analog types, the number of data is always in words.
Address Format |
Address format (Analog, Digital)
Identifier | Address |
Address format (Bit data from Analog)
Identifier | Address | . | Bit number |
Identifier : All the MODBUS addresses should start with the identifier. If the user tries to read bit data from an analog address, the identifier must be either 3 or 4, and itβs read-only.
Address : Enter the starting address of the data to read from. It can range from 1 to 65536. In case of using hexadecimal number to indicate the address, add 'h' at the end of the address. (Example : 100FFh = 255th Input Status)
Bit number : Enter a value that ranges from β0β to βFβ. Only hexadecimal value is allowed.
Example 1 : β10009β = 9th address of Coil Status
Example 2 : β41001.Fβ = 16th bit in 1001st address of Holding Register