The Series 90 Triplex Communications enabler supports the receipt of unsolicited data from Series 90-70 and Series 90-30 PLCs. The maximum message size is 2048 bytes.
All unsolicited points for the Series 90 Triplex Communications enabler need to be configured on the first TCP/IP port (TRIO). If multiple projects using S90 Triplex are configured, unsolicited data should be enabled for one port on one project only. (more simply - Unsolicited data should only be enabled on one active project prr computer.) Unsolicited points on other ports will not be received.
A CIMPLICITY device point can be updated by unsolicited data messages if it meets the following criteria:
The point length in bytes is less than or equal to the data length that is transmitted in the message.
The Series 90 TCP/IP address of the device configured for the point matches that of the sending device.
The configured point address matches the Memory Type and Starting Address in the unsolicited data message.
If the data length of the message exceeds the point length, the point is not updated and a message is logged to the Status Log.
Enabling Unsolicited Data
By default, unsolicited data collection is disabled.
To enable unsolicited data collection, configure the project level global S90TCP_ALLOW_UNSO with a value of Y.
Unsolicited compound messages with timestamps.
About Series 90 TCP/IP Triplex.