The A/D converter on the FPGA enabled up to 8 different points to be monitored remotely, and for alarms to be generated to alert operation personnel.
There were three aspects of that needed to be worked out:
- Signal Conditioning after determining the linear range of the A/D, the next task was to condition voltages to be in that range, so that they could be measured.
- Transmission the monitored values needed to be sent somewhere where they could be monitored. As the controller has a built-in SIP client, the messaging facility was used to transmit the data to a remote site.
- Display and Alarm Generation the data was monitored at a server that also has a SIP client to receive the data. The receiving software has a built-in Web page generator for viewing the current status, and alarm messages are sent back to the SIP client for transmission to a SIP phone.
Below is a sample alarm generated by the monitoring software.