The DIN Rail Mount Series SCD offers multiple PID loops in a compact size. Each SCD1000 master controller can be combined with up to seven SCD2000 slave controllers without any wires. Each controller has one universal input, one relay output and one user selected output. The outputs can be used for a dual loop to control heating and cooling or a single loop with an alarm. These controllers support up to 64 ramp/soak actions. The SCD series controllers are programmed via a user-friendly software program via the RS-485 Modbus® communications.