ABB PS87C0A Bus Extension and Termination Board

Configured for high-speed signal synchronization across modular distributed control networks, the ABB PS870A (PS870A Bus extension and termination board) provides direct physical/electrical execution. Operating within ABB Advant OCS and MOD 300 distributed control system racks under an active DC rail matrix, this hardware assembly maintains bus impedance matching via integrated termination resistors while routing regulated power potentials to specialized slot modules.

Hardware Specifications

Industrial Control and Drives Dedicated Backplane Processing

The PS870A manages multi-rack communication structures directly over the system's distribution backplane. To transmit parallel data lines and diagnostic interlocks without transmission line reflections or signal attenuation, the integrated termination resistors stabilize impedance thresholds to optimize backplane bus communication velocity. This layout suppresses line echo distortion during high-speed processor polling cycles, supporting clean signal execution and expanding modular I/O density scaling options across interconnected AC 800PEC chassis frames. Because the passive and active distribution circuits are built to pass unmanaged, bitwise clock frequencies, the board maintains strict firmware flash compatibility with upstream master controllers. This allows updated system configuration tables and expansion block definitions to cross the bus boundary without creating signal transit noise or network timeouts.

Frequently Asked Questions

Q: How do the integrated termination resistors on the PS870A impact the overall backplane bus communication velocity?

A: The termination network matches the characteristic impedance of the extended data lines. By absorbing signal reflections at the physical ends of the bus run, the resistors maintain sharp wave-edges on the data tracks, preventing data bit errors and keeping the backplane bus communication velocity stable at maximum throughput.

Q: What specific failure states result from an input voltage drop below the 19 VDC threshold boundary?

A: A power supply drop below 19 VDC destabilizes the 5 VDC main and +/-15 VDC secondary voltage outputs. This output drop shuts down the logic transceivers on connected expansion modules, forcing the primary controller to log an immediate communication timeout and drive the subrack into its fallback state.