Push Data Support

OPC Factory Server (OFS) supports "push data", which allows a remote device to connect as a Modbus/TCP server and write data in a format that includes a timestamp.

The OFSOPC driver supports this functionality by implementing push-data items as time-stamped digital alarms, time stamped analog alarms and event trends.

Subscribing to a push-data item

The OFSOPC driver initially gathers push-data configuration information from the OFS configuration file DeviceConfig.xml. For each item, the address is checked to determine if it is located within a push-data area. If this is the case, the item is added to the OFS group that has the fastest subscription rate to help ensure that changes will be transmitted from OFS to Plant SCADA as efficiently as possible.