![]() ![]() When using the MODBUS protocol, CitectSCADA combines two registers to store a long data type in a PLC. Mode 3 has the same range as mode 1, but with the register order swapped. Mode 2 has the same range as mode 0, but with the register order swapped. In the MODNET protocol, LONG data types default to a simplified implementation, with a shortened range of 0 to 655,359,999 - mode 0. Please use the parameter to change the byte order for Real data type Therefore, it is recommended to use Modnet protocol. Base on the default setting, some of parameters cannot be changed. These protocol options will select the correct addressing modes, select certain INI values and other settings to provide compatibility with these devices without the need to set any other special parameters. Modnet20 is specified for TSX Quantum PLC ranges. It is allowed to change the reading order of the bytes on PLS by change the parameter in citect.ini file for MODNET protocol. The tag with Real and Long data type is 2 words (4 Bytes) format.
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