MBSlaveRTU
Function Block - MODBUS RTU Slave protocol on serial port.
Inputs
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Input |
Data type |
Description |
|
IN |
BOOL |
Enabling command: the port is open when this input is TRUE. |
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PORT |
STRING |
Settings string for the serial port (e.g. 'COM1:9600,N,8,1'). |
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SLV |
DINT |
MODBUS slave number. |
Outputs
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Output |
Data type |
Description |
|
Q |
BOOL |
TRUE if the port is successfully open. |
Remarks
When active, this function block manages the MODBUS RTU Slave protocol on the specified serial communication port. The configuration of the MODBUS Slave map (designing MODBUS addresses) is done using the MODBUS configuration tool, from the Fieldbus Configurator.
There can be several instances of the MBSlaveRTU working simultaneously on different serial ports. Other MODBUS Slave connections (TCP server, UDP) can also be active at the same time.
The slave number entered in the MODBUS Slave configuration tool is ignored when MODBUS Slave protocol is handled by this function block. Instead, the SLV input specifies the MODBUS slave number.
MBSlaveRTU always works with the first server in the configuration.
ST Language
MySlave is a declared instance of MBSlaveRTU function block.
MySlave (IN, PORT, SLV);
Q := MySlave.Q;
FBD Language
LD Language
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MBSlaveRTU |
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IEC 61131-3 Automation platform > Drivers - Fieldbus configuration > MODBUS Slave > Driver-specific information > Driver specific function blocks > MBSlaveRTU |
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