Tech Note 74: How to configure Wonderware DASABCIP for unsolicited message handling

For certain classes of critical alarms, it may be best to allow the PLC (Programmable Logic Controller) to notify the data clients immediately rather than waiting for a polling interval to update the alarm point at the HMI (Human Machine Interface). For this type of event, certain Allen Bradley PLCs (i.e. ControlLogix family) have the ability to send unsolicited messages to clients. This tech note provides the procedure to configure a Wonderware DASABCIP topic to accept unsolicited messages.

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