Product Details:

SIEMENS QLBDMNBN is a BDM bus diverter module designed for QUADLOG and APACS+ distributed control rack systems, which is specially used for bus signal switching and isolation in redundant DCS architectures. It can switch the backplane bus connection between the primary control rack and standby rack, achieve bumpless control transfer when the main controller fails, and prevent bus conflict caused by simultaneous operation of master and standby units. The module isolates the faulty bus segment automatically once abnormality appears, so that the normal control rack can keep running steadily without interference. It adopts industrial reinforced PCB and comprehensive EMC shielding design, equipped with surge suppression and signal conditioning circuits to reduce electromagnetic coupling and signal attenuation inside the cabinet, ensuring reliable bus signal transmission during switching actions.

It adopts standard backplane plug-in installation structure, supporting quick removal and replacement during on-site maintenance and bus fault troubleshooting, helping technicians restore the redundant control architecture rapidly. The module integrates built-in bus diagnostic function, which can detect bus collision, communication timeout and hardware failure status, and upload fault alarm information to the upper monitoring station for fast fault location. Users can configure switching priority and interlock parameters through APACS+ engineering software to match different redundant control schemes. Every spare module will complete bus switching test, redundant coordination test and rack compatibility verification before shipment to guarantee stable matching with original QUADLOG hardware. It is widely stocked as emergency replacement spare parts for safety-critical redundant process control systems.

Industry Applications: Applied in petrochemical auxiliary skids, gas flow control systems, boiler closed-loop  control rooms and water treatment facilities for conventional analog signal acquisition and valve regulating output.

Note: Confirm SAM combined I/O feature and hardware revision before ordering

This is from our current stock.