![labview modbus labview modbus](https://www.dmcinfo.com/Portals/0/2-datablocks-siemens.png)
If status is TRUE, code is a nonzero error code. Status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.Ĭode is the error or warning code. Right-click the error out front panel indicator and select Explain Error from the shortcut menu for more information about the error. Otherwise, it describes the error status that this VI or function produces. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information.
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The exception code mapping is as follows:įor more information about these error codes, refer to your device's documentation.Įrror out contains error information. For more information about VISA resource names, refer to the NI-VISA Help.Ĭoils represents the data read from the slave.Įxception Code is nonzero if a MODBUS error has occurred. The class matches that of the VISA resource name input. VISA resource name out is the resource to which a VISA session is opened and its class.
#Labview modbus how to#
The source string includes the name of the VI that produced the error, what inputs are in error, and how to eliminate the error. Source identifies where an error occurred. If status is FALSE, code is 0 or a warning code. If status is TRUE, code is a negative error code. The default is FALSE.Ĭode is the error or warning code. Status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.
![labview modbus labview modbus](http://force-testing.co.uk/wp-content/uploads/2013/03/Modbus-VI-Program-e1363695863870.jpg)
Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. If an error occurs while this VI or function runs, the VI or function runs normally and sets its own error status in error out. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. Timeout specifies the maximum time period, in milliseconds, that the VI waits for the slave's response before throwing an error.Įrror in describes error conditions that occur before this VI or function runs. For example, if Starting Address is 0 and Quantity is 4, the VI reads coils from the slave at address 0, 1, 2, and 3.
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The VI returns the coil at Starting Address and each following coil up to Quantity. Quantity represents how many coils to read from the slave. For example, a register name defined as 2 in a MODBUS configuration device translates to register address 1 in the Holding Registers table of the LabVIEW MODBUS library, as shown below. The MODBUS LabVIEW library expects register addresses, not register names, so you may need to subtract 1 from the address you defined in the MODBUS device configuration software. Per MODBUS convention, the register address of the slave device is calculated by subtracting 1 from the register name that you specify in the master device configuration software. In most MODBUS device configuration software, you must enter a name for the register you want to use.
#Labview modbus software#
Refer to your device's documentation to find the coil address mapping.īe sure to specify the correct address in the MODBUS device configuration software for the register you want to use in LabVIEW. This address is sometimes referred to as offset. Starting Address is the first address location of the coil to read. For more information about VISA resource names, refer to the NI-VISA Help. This control also specifies the session and class. VISA resource name specifies the resource to be opened. Note: Consult your device documentation to find out how to validate/change the address of your device. This property is usually valid for RS-485 networks, which can have multiple MODBUS devices connected to the same network. This is the address of the slave you are communicating with.
#Labview modbus serial#
The Serial Parameters in LabVIEW is a cluster containing an enum ( Mode) and an integer ( Slave Address).ĭata is represented in ASCII, so it is human readable. Refer to the MODBUS specification for more information about the MODBUS Frame. Serial Parameters are parameters that modify the way the MODBUS frame is structured.