The ABB PMKHRMPBA10001, also cataloged as the PMKHRMPBA10001 Processor Bus Adaptor Cable, operates as a dedicated hardware component for high-speed processor bus interconnection within ABB Bailey Infi 90 Distributed Control System (DCS) racks.

Part Number Architecture and Variant Matrix

• PMKHRMPBA10001 Base Standard: Standard 6 twisted-pair processor bus connection cable assembly.
• PMKHRMPBA10001-A Shielded Variant: High-density braided shield variant for high electromagnetic interference environments.
• PMKHRMPBA10001-C Custom Length Option: Factory-terminated custom length configuration for multi-cabinet routing.

Technical Data Specifications

Deterministic Backplane Bus Communication Performance

In Bailey Infi 90 architectures, the PMKHRMPBA10001 cable maintains low-latency backplane bus communication velocity across processing modules. The matched 100 Ohm differential impedance minimizes signal reflection, maintaining high signal integrity for high-rate deterministic data transfers between master processing units and bus adaptors. The 500 V RMS conductor-to-screen galvanic isolation shields processor communications from grounding loops and transient voltage spikes.

Packaging and Delivery Contents

• 1 x ABB PMKHRMPBA10001 Processor Bus Adaptor Cable Assembly
• 1 x Cable Inspection Certificate and Testing Report

Cabinet Wiring and Installation Guidelines

• Bending Radius: Maintain a minimum static bending radius of 10 times the cable outer diameter during tray routing.
• Route Separation: Separate the signal bus cable from 230 VAC / 480 VAC power lines by a minimum of 300 mm in conduits.
• Shield Grounding: Connect the cable shield drain wire directly to the system protective earth (PE) busbar at a single point to prevent ground loops.
• Connector Strain Relief: Secure the connector backshells using the built-in thumbscrews to prevent mechanical stress on the PCB headers.

Frequently Asked Questions

• How does improper impedance matching affect the Infi 90 processor bus performance?

  Impedance deviations beyond the 100 Ohm +/-10 % specification cause signal reflections, resulting in bus communication retry spikes, timing jitter, or module offline faults.

• Is hot-swapping or hot-unplugging allowed for the PMKHRMPBA10001 cable?

  Unplugging the processor bus cable while the node is powered drops communication instantly and can trigger process trips or module failure states in active DCS racks.

• What is the dielectric breakdown rating between conductors and internal shielding?

  The cable insulation withstands a maximum continuous galvanic isolation testing level of 500 V RMS conductor-to-screen without breakdown.

• How does jacket temperature exposure alter signal transmission velocity?

  Exceeding the -40 to +80 deg C jacket rating degrades the outer dielectric layer, shifting the nominal 5.2 ns/m propagation delay and causing frame timing mismatches.

• What wire gauge size is used for signal transmission in this harness?

  The assembly utilizes 12 conductors laid out as 6 twisted pairs, each constructed from 7/0.25 mm tinned copper strands equivalent to 19 AWG wire.

• How should spare, unused twisted pairs inside the assembly be terminated?

  All 6 pairs in the factory cable assembly are pre-terminated to match the pinout of the Infi 90 PBA connector modules and must not be altered.

• Can this cable be spliced or extended in the field using terminal blocks?

  Field splicing disrupts the 100 Ohm characteristic impedance and shield continuity, leading to packet loss; continuous single-cable runs must always be used.

• What voltage level limits apply to signals carried over this cable?

  The maximum continuous working voltage rating for signal conductors within the harness must not exceed 30 V RMS relative to adjacent conductors or ground.