Modbus poll 7.1 0
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This is a limitation with 32-bit data types.
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By default, ETHERNET_IP is a 32-bit unsigned integer, which will be truncated if put into in a 32-bit float. tbl_Values = MB.readNameArray("ETHERNET_IP", 2, 0) - This will read the Ethernet IP as two 16-bit unsigned integers.tbl_Values = MB.readNameArray("AIN2", 3) - This will read three floating point values (32-bits each) from AIN2, AIN3, and AIN4 (addresses 4, 6, and 8):.tbl_Values - Lua table containing the values read.When this parameter is provided, the passed data type will be used. dataType_override (optional) - When this parameter is not provided, the default data-type for the register will be used.numValues - Integer number of values to be read.register_name - Name of the Modbus register to start reading from.Subsequent registers will be incremented according to the register's data type. The first register read will be the address associated with the register "name". Sequentially reads one or more values from Modbus registers. Tbl_Values, error = MB.readNameArray("register_name", numValues, dataType_override) To write multiple 32-bit values, see MB.writeNameArray below. MB.writeName("IO_CONFIG_SET_CURRENT_TO_FACTORY", 1).Any errors encountered will be returned in error. Writes a single value to a Modbus register. To read multiple 32-bit values, see MB.readNameArray below.Įrror = MB.writeName("register name string", value) serial_num = MB.readName("SERIAL_NUMBER").firmware_ver = MB.readName("FIRMWARE_VERSION").Any errors encountered will be returned in "error." Some examples: Reads a single value from a Modbus register. Value, error = MB.readName("register name string") Name functions use more memory than address functions.Name functions are 0.1% to 20% slower than their address equivalents (see Modbus Address Functions below).This makes them easy to understand because registers are referenced by name, like DIO_STATE, instead of addresses, like 2800. Modbus Name Functions use register names like LJM's eReadName and eWriteName. It is important to note that function calls dealing with 32-bit integers require special attention due to 32-bit floats being the only valid numerical type. The MB and LJ libraries allow access to the Modbus map and provide timing control.