The 6ED1057-4CA00-0AA0 is an output module from Siemens which is part of their LOGO! logic controller series. It is an 8-channel digital output module with 0-20mA current transmission and a short-circuit-protected output. This module has a built-in temperature monitoring system to monitor temperature rise and a signal contact which can be used to signal an over-temperature condition. It can be used to control relays, impulse relays, solid-state relays, signal lamps and contactors. It also has a "Status LEDs" interface to allow for visual signal monitoring.This module is suitable for direct mounting onto 35mm DIN rails and comes with a screwless 2-part chassis.