Configured for redundant ControlNet communication with 1771 I/O racks, the Allen-Bradley 1771-ACNR15 (1771ACNR15 ControlNet Remote I/O Adapter) provides a two-port interface for ControlNet 1.5 and later networks. It is also specified for the ControlNet PLC-5 backup system using the 1785-CHBM module.

Model Identification

The supplied model references are:

• Base catalog number: 1771-ACNR15
• Compact catalog reference: 1771ACNR15
• Product family: Allen-Bradley 1771 I/O
• Controller platform: PLC-5
• Network: ControlNet 1.5 and later
• Function: ControlNet Remote I/O Adapter
• Status: Discontinued by manufacturer in 2012

The 1771-ACNR15 is specifically identified for the ControlNet PLC-5 backup system using the 1785-CHBM. The supplied data does not define additional suffix functions for the base catalog number.

Hardware Specifications

ControlNet Network Interface

The 1771-ACNR15 provides two ControlNet network ports for redundant media configurations. The communication path is associated directly with the 1771 I/O adapter function and ControlNet 1.5 and later operation.

For the specified PLC-5 backup architecture, the supplied product information identifies the 1771-ACNR15 as the required 1771 I/O adapter when used with the 1785-CHBM backup system.

Network cabling should maintain the prescribed ControlNet topology and physical separation requirements. Communication wiring should be routed separately from high-energy power conductors where practical to limit conducted and radiated electrical interference.

Ordering Information

• 1 x Allen-Bradley 1771-ACNR15 ControlNet Remote I/O Adapter
• No separate accessory kit is identified in the supplied product data.
• ControlNet network cabling, connectors, and 1785-CHBM backup hardware are not specified as included with the adapter.

Field Installation Guidelines

Rack installation

• Install the module in the designated 1771 I/O system position.
• Confirm that the module is mechanically seated before applying system power.
• Inspect the backplane connector for contamination or damaged contacts before installation.

ControlNet connection

• Connect the ControlNet media according to the network topology defined for the installation.
• For redundant media operation, verify both communication paths before placing the system into service.
• Keep network cables separated from high-voltage switching conductors where practical.

Grounding and shielding

• Follow the system grounding method specified for the ControlNet installation.
• Avoid creating unintended shield-current paths through multiple grounding points.
• Inspect cable shields and connectors for mechanical damage before commissioning.

Backup system

• When implementing the PLC-5 backup system, verify that the 1771-ACNR15 is used with the specified 1785-CHBM architecture.
• Do not substitute an unspecified 1771 I/O adapter when the installation requires the documented backup configuration.

Technical FAQ

• What network does the 1771-ACNR15 support?

  The supplied data identifies the module for ControlNet 1.5 and later networks. It functions as a ControlNet interface for 1771 I/O systems.

• How many ControlNet ports are provided?

  The module is specified as a two-port redundant media ControlNet communication interface. Both ports are associated with the redundant network connection.

• Can it be used with a PLC-5 backup system?

  Yes. The supplied information specifically identifies the 1771-ACNR15 for the ControlNet PLC-5 backup system using the 1785-CHBM module.

• What I/O platform does the adapter interface with?

  The 1771-ACNR15 is a 1771 I/O adapter. It provides the ControlNet communication interface required for the associated 1771 I/O architecture.

• Is the module hot-swappable?

  Hot-swap capability is not specified in the supplied data. Installation should therefore be performed according to the applicable 1771 I/O system procedures.

• What is the operating temperature range?

  A specific operating temperature range is not included in the supplied specifications. No numerical temperature limit should be assumed from the available data.

• What is the power consumption?

  The supplied information does not state a numerical power consumption value. The module should be evaluated against the applicable 1771 chassis power budget.

• What should be checked before commissioning?

  Verify mechanical seating, ControlNet cabling, redundant media connections, grounding, and compatibility with the intended PLC-5 and 1771 I/O configuration before energizing the system.