Allen-Bradley | ControlLogix Time Synchronization Module | 1756-TIME

Overview

The 1756-TIME (1756-TIME) is a precision time synchronization module designed for the ControlLogix® platform. It serves as a highly accurate time reference for industrial networks, utilizing Global Positioning System (GPS) technology or Precision Time Protocol (PTP) to synchronize controllers across a distributed architecture. This module is essential for applications requiring precise sequence-of-events (SOE) recording, coordinated motion control, or synchronized data logging across multiple chassis. By providing a unified "Grandmaster" clock, the 1756-TIME (1756-TIME) eliminates time drift and ensures data integrity throughout the enterprise.

Detailed Technical Specifications

• Primary Function: System Time Coordination and Clock Synchronization

• Backplane Power Requirements: 1.01A @ 5.1V DC and 2.64 mA @ 1.2V DC

• Thermal Management: Max surrounding air temp of +50 °C (+122 °F) in Series B Chassis; +60 °C (+140 °F) in Series C Chassis

• Environmental Humidity: 5% to 95% (non-condensing) per IEC 60068-2-30

• EMI/RFI Emissions: Compliant with IEC 61000-6-4 standards

• ESD Immunity (IEC 61000-4-2): 4 kV contact; 8 kV air discharge

• EFT/B Immunity (IEC 61000-4-4): ±2 kV at 5 kHz on both signal and communication ports

• Radiated/Conducted RF Immunity: 10V rms with 1 kHz sine-wave 80% AM (150 kHz…80 MHz)

• Wiring Classification: Category 2 for signal and communication ports

• Physical Enclosure: Open-style (None)

• Module Dimensions: 14.52cm x 3.46cm x 13.96cm

• Shipping Mass: Approximately 3 kg 

Operational Capabilities and Precision

The 1756-TIME (1756-TIME) module provides a versatile interface for time distribution, supporting NTP (Network Time Protocol) as well as the high-precision IEEE 1588 PTP standard. It is equipped with an onboard battery-backed real-time clock to maintain synchronization during power cycles. In large-scale systems, this module acts as the synchronization anchor, ensuring that all 1756-series I/O and controllers share a nanosecond-resolution time stamp, which is critical for fault analysis and power utility applications.

Technical FAQ

• Does this module require an external antenna?Yes, when utilized as a GPS time source, the 1756-TIME (1756-TIME) requires a compatible external GPS antenna and a clear line of sight to the sky to lock onto satellite signals.

• Can the module function without a GPS signal?Yes, it can act as a PTP slave, synchronizing its clock to another Grandmaster clock on the Ethernet/IP network, or it can operate based on its internal high-stability oscillator.

• Is there a difference in thermal performance between chassis series?Correct. The improved airflow and design of the ControlLogix Series C chassis allow the 1756-TIME (1756-TIME) to operate at a higher ambient temperature (+60 °C) compared to the Series B chassis (+50 °C).