The Allen-Bradley 1756-HIST2G, also cataloged as the 1756-HIST2G Historic Machine Edition Module, operates as a dedicated hardware component for machine data recording and historical information processing within ControlLogix automation platforms.

Model Identification

Hardware Configuration Details

The 1756-HIST2G is a ControlLogix platform module designed for historical machine information handling. The module integrates an embedded processor, local memory resources, real-time clock functionality, and Ethernet communication capability.

The hardware uses an AMD LX800 500 MHz x86 processor architecture with battery-backed SRAM for retaining stored information. A rechargeable lithium battery supports memory retention and clock operation.

ControlLogix Communication Features

The module operates within the ControlLogix system environment and exchanges data through the chassis backplane interface. The integrated Ethernet port provides 10/100T IEEE 802.3 network connectivity for machine data communication functions.

Allen-Bradley ControlLogix modules use deterministic backplane communication for coordinated interaction between controllers, communication modules, and specialty modules. System configuration should confirm chassis compatibility, firmware revision requirements, and network addressing parameters.

Real-Time Data Processing Characteristics

The integrated precision real-time clock provides time reference functions for historical machine data operations. The 4-character alphanumeric display and status LEDs provide local diagnostic information for module status monitoring.

The module includes cache memory consisting of 128 K L1 and 128 K L2 resources, supporting embedded processor operation and internal data handling functions.

Ordering Information

• 1 x Allen-Bradley 1756-HIST2G Historic Machine Edition Module
• Series: ControlLogix
• Ethernet interface: 1 x 10/100T IEEE 802.3 port
• Memory configuration: 512 Kbytes battery-backed SRAM
• Battery type: Rechargeable lithium battery, non-removable
• Display: 4-character alphanumeric indicator

Installation Guidelines

Chassis Installation

• Verify the ControlLogix chassis slot allocation before mounting the module.
• Confirm controller firmware and module firmware compatibility before commissioning.
• Install the module according to the ControlLogix chassis grounding requirements.
• Ensure the module is fully seated into the backplane connector.

Network Connection

• Use shielded Ethernet cabling according to the installation environment.
• Separate Ethernet wiring from high-voltage power conductors where possible.
• Confirm network parameters before connecting the module to an active industrial network.
• Verify LED indicators after power-up to confirm normal module status.

Maintenance Considerations

• Do not remove the rechargeable lithium battery unless authorized maintenance procedures specify replacement.
• Backup stored configuration data before performing system modifications.
• Verify memory retention functions during scheduled maintenance activities.

Frequently Asked Questions

• What system platform does the 1756-HIST2G belong to?

  The 1756-HIST2G is part of the Allen-Bradley ControlLogix platform and is designed for historical machine information processing.

• What Ethernet interface is included?

  The module includes one Ethernet 10/100T IEEE 802.3 communication port.

• What processor architecture is used?

  The module uses an AMD LX800 500 MHz x86 processor architecture as specified in the supplied technical data.

• What type of memory is installed?

  The module provides 512 Kbytes of battery-backed SRAM and includes 128 K L1 and 128 K L2 cache memory.

• Does the module contain a real-time clock?

  Yes. The module includes a precision real-time clock for time reference functions.

• What type of battery is installed?

  The module uses a rechargeable lithium battery with a non-removable design.

• What power consumption is required?

  The supplied specification lists 5 W typical power consumption and 7 W maximum power consumption.

• Can the module be installed in any ControlLogix chassis?

  Installation requires verification of chassis compatibility, firmware requirements, and system configuration before operation.