1. A signal interface system comprising: a common front-end section, coupleable in communication to a signal input source, wherein the signal input source is one of a discrete input source and a process variable input source; and a monitor module section coupleable in communication with the common front-end section, the monitor module section configurable to receive one of a discrete input signal and a process variable input signal from the signal input source, wherein the monitor module section is coupleable to a user output destination device.