Unsolicited data is supported for this communication interface. Ladder logic must be developed to support the communications. Be sure that the unsolicited data is transmitted at a reasonable rate to the CIMPLICITY host computer. The ladder logic should also check to ensure that the connection has been made and that the requests are acknowledged.
Examples of ladder logic are provided in the Mitsubishi Melsec P.L.C. documentation.
The format of the unsolicited data message is:
Number of words in the message
Offset address
Data value
Offset address
Data value
.
.
.
The communication enabler automatically assumes that the Fixed Buffer data is to be updated.
Consider the following example:
4
0x500
0x10
0x501
0x20
Any point with a point address of U0500 whose point size was less than or equal to 2 bytes is updated to a value based on 0x10. For example, an ANALOG_16 point at U0500 would be 0x10.
Any point with a point address of U0501 is also be updated as long as the point size is less than or equal to 2 bytes. The points are updated based on U0501 having a value of 0x20.
|
|
About Mitsubishi TCP/IP Communications. |
