Traditionally there are only 4 types of data appears in Modbus PLC, i.e. Holding Register (4x), Input Register (3x), Output Coil (0x) & Input Coil (1x), whereby Holding Register & Input Register are 16 bit integer wherease Output Coil & Input Coil are Boolean data type. Floating point & Long analogue data in 32 bit or 64 bit can then be stored on multiple Holding or Input Registers. To configure a tag entry for Input Register (3x) or Input Coil (1x) will need to set the Input Tag of Tag Properties to "True", hence they are both read-only tag and the value can't be changed by using setTag() function call in Script.