This example demonstrates how Geo SCADA Expert might be configured to scan Link Register data on a Mitsubishi MELSEC A PLC.
In the example, a Mitsubishi Scanner is used to scan the address range W0003 to W000A in Link Register W. The example demonstrates how an analog point might be used to represent data that resides at addresses W0004 and W0005 in that Link Register.
Example:
A scanner scans several Link Registers on a Mitsubishi PLC. Within Geo SCADA Expert, the Scanner has this configuration (the PLC type is set to ACPU):
This configuration determines that the scanner scans the Link Register W device range W0003 to W000A within the PLC (Link Registers have hexadecimal notation in the PLC).
An analog point is to represent the data that is located at W0004 and W0005 within the above address range. Within Geo SCADA Expert, the analog point has this configuration:
In order to read the value of this point, the scanner extracts all of the bits from Link Register addresses W0004 and W0005. (Each Link Register is one 16-bit Word and the analog point comprises two Words (as DINT data = 32-bits).)
Operators can confirm the address range that the scanner is scanning by looking at the Source attribute on, for example, a List:
They can also use the point’s Source attribute to confirm the type of data and address of the Link Register with which the individual analog point is associated:
