Modicon AS-BDAU-204 The Modicon AS-BDAU-204 is a 4-channel analog output module which is designed to control adjustable frequency drives, positioning valves, dampers, etc. Each channel is independently configurable to provide either voltage or current loop output. The ASBDAU204 module features open current loop (broken wire) detection with warnings via LED’s and accessible registers. The ASBDAU204 can be configured to hold last value in the event communication to the CPU is lost for more than 1 second, the CPU is stopped or power is lost.