The Solves-It! Analog Series of PLCs from Divelbiss Corp., Fredericktown, OH, are for small system control and monitoring applications. The devices accept a 0–10 VDC differential input and support 6 digital I/O channels, two of which are fixed as outputs while the rest are dual-purpose and can be used as either inputs or outputs as required. One channel can be used as a high-speed counter input. Other features include 2 potentiometers for external set-point adjustment for analog or digital functions and an enhanced model with 2 programmable momentary pushbutton switches, a real-time clock with battery back-up, and a 4-digit numeric display. You program the PLCs in ladder logic with function blocks using included software.