Allen-Bradley 1756HP-GPS ControlLogix GPS Receiver Module

Configured for satellite-based time synchronization and positional data acquisition in ControlLogix 1756 platforms, the Allen-Bradley 1756HP-GPS (1756HP-GPS GPS Receiver Module) provides direct physical execution of GPS L1-band signal decoding for system-wide time stamping and distributed controller alignment within ControlLogix backplane architectures.

The module processes GNSS satellite signals and converts NMEA 0183 data streams into controller-level time reference inputs, enabling deterministic event correlation across multi-node automation systems.

Suffix Breakdown & Model Matrix

• 1756: ControlLogix 1756 platform chassis family

• HP: Hiprom integration platform designation

• GPS: Global Positioning System receiver function

Hardware Specifications

ControlLogix Backplane Timing Deterministic Synchronization Layer

Within Allen-Bradley ControlLogix architectures, the 1756HP-GPS integrates through backplane power and data routing layers to inject high-precision UTC time references into controller execution cycles. The module aligns distributed controllers by translating satellite-derived timing into system-level timestamp events.

Backplane communication is limited to timing reference propagation and diagnostic data exchange. The module does not participate in I/O scan cycles but influences event sequencing resolution through controller clock synchronization.

GPS-derived timing stability depends on continuous L1-band signal acquisition and antenna visibility, with NMEA 0183 message parsing executed within internal receiver firmware logic.

Frequently Asked Questions (FAQ)

Q: Does the 1756HP-GPS require continuous satellite visibility for operation?
A: Yes. Loss of L1-band reception disables external synchronization and forces internal holdover timing mode.

Q: Can the module be hot-swapped in a live ControlLogix chassis?
A: Hot-swap is dependent on chassis configuration and controller state; removal during active synchronization may interrupt time alignment.

Q: Does the module affect ControlLogix scan or backplane performance?
A: No. It operates outside I/O scan execution and only injects time reference data into controller system clock.

Field Installation Guidelines

Install the module in a ControlLogix chassis slot with proper backplane alignment and ensure system power is managed according to controller installation procedures.

Mount the GPS antenna with unobstructed sky view to maintain stable satellite acquisition. Use specified SMA/TNC connectors and maintain shield continuity on RG58 cable routing.

Avoid electromagnetic interference sources near antenna feed lines. Maintain correct grounding of chassis to stabilize signal reference potential and prevent timing jitter during reception transitions.