Allen-Bradley SST-PB3-CLX Communication Module

The Allen-Bradley SST-PB3-CLX, also cataloged as the SST-PB3-CLX Communication Module, operates as a dedicated hardware component for PROFIBUS DP-V0/DP-V1 master and slave data exchange within Allen-Bradley ControlLogix backplane platforms.

Hardware Specifications

Deterministic Network Gateway & Dynamic Data Mapping

The Allen-Bradley SST-PB3-CLX integrates a high-speed PROFIBUS RS-485 physical interface supporting baud rates up to 12 Mbps for deterministic control across decentralized field devices. Operating within the ControlLogix chassis, the module provides direct I/O image mapping and paged memory access up to 250 status words to balance backplane bus communication velocity with maximum payload throughput. Onboard diagnostic assets, including a 4-character scrolling display and dedicated COMM, SYS, and OK status LEDs, deliver real-time operational feedback without requiring external programming tools.

Frequently Asked Questions

Q: Does the SST-PB3-CLX support simultaneous PROFIBUS Master and Slave operation on the network?

A: Yes. The module firmware supports both PROFIBUS DP-V0 and DP-V1 protocol stacks in Master or Slave modes, enabling master data collection and slave status reporting over a single RS-485 bus line.

Q: What power draw does the SST-PB3-CLX place on the ControlLogix backplane?

A: The module draws 850 mA from the 5 VDC backplane rail or 1.75 mA from the 24 VDC rail depending on chassis power supply distribution configuration.

Q: How is the PROFIBUS bus baud rate configured on the SST-PB3-CLX interface?

A: The onboard network interface features auto-detection capability across standard PROFIBUS communication speeds from 9.6 kbps up to 12 Mbps, matching master node configuration automatically upon bus initialization.

Field Installation Guidelines

1. Insert the SST-PB3-CLX module into any available slot in a ControlLogix 1756 backplane until the top and bottom chassis levers click into place.
2. Connect a shielded PROFIBUS RS-485 cable equipped with a standard 9-pin D-sub male connector to the module front interface.
3. Verify that bus termination resistors are switched ON at both physical endpoints of the PROFIBUS RS-485 line.
4. Route PROFIBUS network cabling in dedicated grounded conduits separated from high-voltage AC power conductors.
5. Apply power to the ControlLogix rack and verify that the front panel OK LED shows solid green signaling backplane initialization.