1006/2/1 HONEYWELL Control module Product Description The Honeywell 10006/2/1 Diagnostic and Battery Module (DBM) is part of the FSC (Fail-Safe Controller) series from Honeywell. Its function is to provide diagnostics and battery backup monitoring for the FSC system.Front-panel display for fault messages (type of fault, rack number, position) so diagnostics are easier.Real-time clock; allows viewing of date/time, system voltages, battery voltage, and internal temperatures