Allen-Bradley 1756HP-TIME/B Time Synchronization Module

Configured for precise time alignment in ControlLogix distributed control environments, the Allen-Bradley 1756HP-TIME/B (1756HP-TIME time synchronization module) provides direct physical and protocol-level time distribution across backplane-connected controllers and external network time sources. The module executes IEEE 1588 PTP and NTP time stamping functions within the ControlLogix 1756 chassis architecture, enabling deterministic event correlation across automation nodes.

Suffix Breakdown & Model Matrix

No official manufacturer-published suffix decomposition is provided for 1756HP-TIME/B. The “/B” revision is treated as hardware or firmware iteration within the HiProm module family without functional redefinition in available technical data.

Hardware Specifications

ControlLogix Backplane Time Distribution Behavior

The 1756HP-TIME/B operates as a time authority node within the ControlLogix backplane architecture, distributing synchronized timestamps through deterministic backplane communication cycles. In multi-chassis systems, time alignment is maintained through external reference inputs (GPS or NTP/PTP), while internal logic aligns module-level scheduling to controller scan cycles.

The module integrates into the 1756 platform communication layer, where backplane timing is exchanged alongside cyclic I/O updates and controller task execution windows.

In systems utilizing EtherNet/IP, external time synchronization can be aligned with PTP boundary clock behavior, allowing coordinated timestamping between distributed controllers and remote I/O nodes.

Frequently Asked Questions (FAQ)

Q: Does the 1756HP-TIME/B support hot-swap replacement in a powered ControlLogix chassis?
A: The module follows standard ControlLogix hot-swap rules. Replacement behavior depends on chassis configuration and controller scan state.

Q: How does the module prioritize NTP versus IEEE 1588 PTP time sources?
A: Source selection is governed by system configuration and synchronization hierarchy defined in the ControlLogix time service settings.

Q: Can multiple 1756HP-TIME/B modules operate in the same backplane?
A: Only one primary time authority configuration is typically active per chassis scope, while additional modules may remain in standby depending on system design.

Field Installation Guidelines

Install the module only in a compatible ControlLogix 1756 chassis slot with proper backplane seating. Ensure full insertion into the backplane connector to maintain deterministic timing communication.

For GPS-based synchronization, route antenna cabling away from high-noise power conductors and variable frequency drive outputs. Maintain continuous shielding continuity and ground termination at a single reference point to reduce timing jitter induced by EMI coupling.

For NTP/PTP deployments, verify network segmentation and switch configuration support for time-sensitive traffic. Avoid unmanaged switching paths that may introduce variable latency into synchronization streams.

Do not install adjacent to high-thermal modules without observing chassis airflow distribution constraints defined by system-level installation standards.