Alternatively, and depending on how complex you want the system, you could consider the OPC functionality of the Easy relay. I have a network of 5 Easy 800 relays, and then use a MS Windows front end, written in VB.Net. It is then almost limitless what you can do, but simple logging of an event - in your case the switching of the pump output, could be written to a text file, and Excel spreadsheet, Access data table, etc.
Regards,
Roger