Component: Modbus Master (SCADA) (Comms: System)
| Author | Matrix TSL |
| Version | 2.1 |
| Category | Comms: System |
Modbus Master (SCADA) component
Modbus component for talking to Modbus compatible hardware via RS232 or RS485.
Component Source Code
Please click here for the component source code: FC_Comp_Source_Modbus_SCADA.fcsx
Detailed description
No detailed description exists yet for this component
Examples
No additional examples
Downloadable macro reference
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ReadHoldingRegister |
| This command requests the analogue holding register values starting from the start RegAddress and going through to RegAddress plus RegCount. Returns 0 for success, 1 for CRC fail and 255 for no reply. | |
 - UINT
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SlaveID |
| The ID of the MODBUS slave | |
| - UINT
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RegAddress |
| Address: 0=40001, 1=40002, ... | |
| - UINT
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RegCount |
| Number of consecutive registers to read, starting from RegAddress | |
 - BYTE
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Return |
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ReadCoil |
| This command requests the ON/OFF status of discrete coils starting from the start CoilAddress and going through to CoilAddress plus CoilCount. Returns 0 for success, 1 for CRC fail and 255 for no reply. | |
| - UINT
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SlaveID |
| The ID of the MODBUS slave | |
| - UINT
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CoilAddress |
| Coil Address: 0=Coil1, 1=Coil2, 2=Coil3, ... | |
| - UINT
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CoilCount |
| Number of consecutive coils to try and read | |
| - BYTE
|
Return |
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SetCoil |
| This command writes the contents of a discrete coil at the location CoilAddress. Returns 0 for success, 1 for CRC fail and 255 for no reply. | |
| - UINT
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SlaveID |
| The ID of the MODBUS slave | |
| - UINT
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CoilAddress |
| Coil Address: 0=Coil1, 1=Coil2, 2=Coil3, ... | |
| - BYTE
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CoilState |
| 0=Off, 1=On | |
| - BYTE
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Return |
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GetResponse |
| Collects as much incoming data as possible and stored into the response buffer. The number of bytes received will be stored into location 0 of the response buffer. Return value indicates validity of incoming CRC. 0 = OK, 1 = CRC fail, 255 = No Data | |
| - BYTE
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Return |
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SetCoils |
| This command writes the contents of a series of discrete coils at the location starting at CoilAddress through to CoilAddress + CoilCount. Returns 0 for success, 1 for CRC fail and 255 for no reply. | |
| - UINT
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SlaveID |
| The ID of the MODBUS slave | |
| - UINT
|
CoilAddress |
| Coil Address: 0=Coil1, 1=Coil2, 2=Coil3, ... | |
| - UINT
|
CoilCount |
| Number of consecutive coils to try and read | |
| - BYTE
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CoilData |
| An array of bytes each containing 8 1-bit coil values | |
| - BYTE
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Return |
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GetResponseByte |
| Reads a byte from the last received response. The Index parametes specifies which byte to read back. | |
| - BYTE
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Index |
| 0=NumBytes, 1=SlaveAddress, 2=FunctionCode/ExceptionCode, 3=DataBytes, 4=data0, 5=data1, .. | |
| - BYTE
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Return |
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ChangeFrameType |
| Default frame type is the type set in the component properties. | |
| - BYTE
|
Type |
| 0 = Modbus RTU / 1 = Modbus ASCII | |
 - VOID
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Return |
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GetResponseInt |
| Reads a 16-bit value from the last received response. The Index parametes specifies the byte index of the value to read back. | |
| - BYTE
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Index |
| 4=data0, 6=data1, 8=data2, .. | |
| - UINT
|
Return |
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SetHoldingRegisters |
| This command writes the contents of several holding registers starting at the location RegAddress through to location RegAddress + RegCount . Returns 0 for success, 1 for CRC fail and 255 for no reply. | |
| - UINT
|
SlaveID |
| The ID of the MODBUS slave | |
| - UINT
|
RegAddress |
| Address: 0=40001, 1=40002, ... | |
| - UINT
|
RegCount |
| Number of consecutive registers to write, starting from RegAddress | |
| - UINT
|
RegValue |
| Array of values to send to the registers | |
| - BYTE
|
Return |
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ReadAnalogInput |
| This command requests the analogue input register values starting from the start RegAddress and going through to RegAddress plus RegCount. Returns 0 for success, 1 for CRC fail and 255 for no reply. | |
| - UINT
|
SlaveID |
| The ID of the MODBUS slave | |
| - UINT
|
RegAddress |
| Input Address: 0=10001, 1=10002, 2=10003, ... | |
| - UINT
|
RegCount |
| Number of consecutive inputs to read, starting from RegAddress | |
| - BYTE
|
Return |
|
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SetHoldingRegister |
| This command writes the contents of a holding register at the location RegAddress. Returns 0 for success, 1 for CRC fail and 255 for no reply. | |
| - UINT
|
SlaveID |
| The ID of the MODBUS slave | |
| - UINT
|
RegAddress |
| Address: 0=40001, 1=40002, ... | |
| - UINT
|
RegValue |
| Value to send to the selected register | |
| - BYTE
|
Return |
|
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ReadDigitalInput |
| This command requests the ON/OFF status of discrete inputs starting from the start DataAddress and going through to DataAddress plus DataCount. Returns 0 for success, 1 for CRC fail and 255 for no reply. | |
| - UINT
|
SlaveID |
| The ID of the MODBUS slave | |
| - UINT
|
DataAddress |
| Input Address: 0=10001, 1=10002, 2=10003, ... | |
| - UINT
|
DataCount |
| Number of consecutive inputs to read, starting from RegAddress | |
| - BYTE
|
Return |
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Initialise |
| Starts up the UART to allow communications | |
| - VOID
|
Return |
Property reference
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Properties |
|
Modbus Properties |
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Frame Type |
| Switches between RTU and ASCII forms of Modbus | |
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Receive Buffer Size |
| Maximum number of bytes the receive buffer can hold | |
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Slave ID Bytes |
| Number of bytes used when passing a slave ID, usually 1 but sometimes 2 | |
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Silent Interval |
| Configures how much time to wait after each master modbus command before another command can be sent. A silent interval of 60ms minimum is required in order to guarentee successful reception of the next transmission. 0=No Delay 60 = 60mS - Default Range : 0 - 65535 | |
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UART Receive Timeout |
| Amount of time to wait before timing out when listening for a slave's response. Range: 0 - 255. 0 = Don't Wait 1 - 254 = X ms 255 = Wait Forever | |
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Receive Timeout Count |
| Number of timeouts in a row to wait for until we decide the slave is not responding or finished responding to a message. Range: 0 - 255 0 = First Timeout Only 1 = First Timeout + 1 2 = First Timeout + 2 | |
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Runtime Properties |
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Label |
| A text label to appear on the Modbus panel object. | |
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Console Data |
| Selects if the console data is automatically generated or not | |
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Console Columns |
| Number of characters that can be displayed on a single line of the console. | |
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Data Source |
| Simulation data source used to allow the component to connect to various remote devices Nothing - Simulation data is ignored COM port - Routes the communication data to and from a physical or virtual COM port Injector - Routes the communication data via a data injector component on the Panel. | |
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COM Port |
| Lists all the current available COM port hardware on your PC. | |
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Refresh Ports |
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Baud Rate |
| COM port data rate in bits per second | |