The Allen-Bradley 1775-GA, also cataloged as the 1775-GA Communication Module, operates as a dedicated hardware component for peripheral serial interface routing within PLC-3 and PLC-5 controller architectures.

System Configuration Options

• 1775-GA: Base hardware module configured for peripheral communication interfaces across PLC-3 system chassis racks.
• 1775GA: Alternate catalog spare number representing identical physical circuitry, line termination load, and backplane pinouts.

Technical Physical Parameters

Deterministic Network Data Handling

The unit manages serial bit stream conversion to ensure stable data exchanges without impacting backplane bus communication velocity. Internal logic buffers enforce determinism across system connections, minimizing data collisions during high-throughput transmission cycles over dedicated serial peripheral links.

Package Component List

• 1 x Allen-Bradley 1775-GA Communication Module
• 2 x 75 ohm line termination resistors
• 1 x Hardware installation guide

Wiring & Physical Setup Rules

• Power Down Sequence
  • Turn off main chassis source power before inserting or pulling the card from the rack logic backplane.
• Voltage Selection & Fusing
  • Match line selection switches and replace inline fuses (1 A for 115 VAC, 0.5 A for 230 VAC) prior to applying power.
• Line Impedance Termination
  • Install the included 75 ohm termination resistors across end-of-line data nodes to reduce signal reflection.
• Cable Separation
  • Keep communication cables separated from motor power cables and high-voltage AC lines by at least 30 cm.

Frequently Asked Questions

• What primary function does the 1775-GA module execute inside the rack?

  It acts as a serial interface controller that processes asynchronous peripheral communications for PLC system hosts.

• How is line termination handled on the communication channels?

  The module utilizes dedicated 75 ohm resistors connected across signal lines to prevent impedance mismatches and reflections.

• What supply voltage ranges are supported by the onboard power interface?

  The module accepts nominal mains input voltages of 115 VAC or 230 VAC within a standard +/- 15% operating tolerance band.

• What type of fuses are required for system input protection?

  Use a 1 A rated fuse for 115 VAC operating configurations and a 0.5 A rated fuse when configured for 230 VAC power.

• Can this module be inserted while the chassis power supply is active?

  No, hot-swapping is not supported; inserting or removing the module under power can damage internal logic circuits.

• What are the storage thermal thresholds for this hardware component?

  The assembly can be stored in non-condensing environments with temperatures ranging from -40 deg C up to 85 deg C.

• How does the module impact backplane bus communication velocity?

  Dedicated protocol buffers maintain high data execution efficiency without introducing delay onto the primary system backplane.

• What relative humidity limits must be maintained during rack operation?

  Operating environments must maintain a relative humidity between 5% and 95% without moisture condensation.