We used to use that product for redundant monitoring of SCADA system. We would monitor door latches, pumps, water levels, etc. It worked great.
We have since moved to Raspberry Pi to meet the needs of other controls we wanted to include in our management systems.
The control by web device will do what you have asked for above. It's very inexpensive too.
If you have, or plan to add, custom alerts, you may want to consider something like a Raspberry Pi to give you unlimited flexibility when it comes to PLC.