Configured for isolated analog signal generation in a PLC-5 I/O system, the Allen-Bradley 1771-OFE1/B (1771-OFE1 Analog Output Module) converts controller data into selectable voltage outputs for external control circuits.

Model and Revision Identification

The supplied model is 1771-OFE1/B. The provided data does not define a separate base-model catalog number or explain the electrical differences associated with revision "/B". No additional suffix functionality is assigned without supporting documentation.

Hardware Specifications

Isolated Analog Output Characteristics

The 1771-OFE1/B provides four isolated analog output channels. The supplied specification identifies selectable voltage ranges of 1-5 VDC, 0-10 VDC, and +/- 10 VDC, with 12-bit module resolution.

The module accepts controller data in BDC or Natural Binary format and converts the digital value into an analog voltage output. The supplied information does not specify output accuracy, linearity, settling time, load impedance, or channel-to-channel isolation voltage.

The listed backplane current is 1.5 mA. This value represents the specified backplane current requirement and should not be interpreted as the current available at the analog output terminals.

PLC-5 Analog I/O Interface

The module interfaces with the PLC-5 architecture through the I/O backplane. Four isolated channels allow analog control signals to be maintained as separate field circuits according to the module's isolation design.

For analog signal integrity, field wiring should be routed separately from high-current switching conductors. Shielding and grounding arrangements should follow the requirements of the connected instrumentation and the applicable control-system installation standard.

The supplied data does not identify EtherNet/IP, PROFINET, firmware loading, or independent network functionality for this module.

Ordering Information

• 1 x Allen-Bradley 1771-OFE1/B analog output module
• 1 x Four-channel isolated analog output module
• No external terminal assembly, mounting accessory, or supplementary kit is identified in the supplied data

Field Installation Guidelines

Chassis Installation

• Install the module in a compatible PLC-5 I/O chassis.
• Inspect the backplane connector before installation.
• Remove system power before insertion or removal unless the applicable PLC-5 documentation explicitly permits energized replacement.
• Ensure the module is fully seated before system operation.
• Protect the module from electrostatic discharge during handling.

Analog Signal Wiring

• Select the voltage range according to the connected field device requirements.
• Use suitable twisted or shielded signal conductors where required by the installation environment.
• Keep analog wiring separated from high-voltage and high-current switching circuits.
• Avoid unintended grounding points that can introduce signal-loop noise.
• Verify signal polarity before applying the analog output to external equipment.

Isolation and Grounding

• Preserve the independent wiring arrangement of the four isolated channels.
• Do not connect isolated channels together unless explicitly permitted by the system design.
• Terminate cable shields according to the applicable instrumentation grounding practice.
• Maintain cabinet bonding and protective grounding independently from low-level signal conductors where required.

Frequently Asked Questions

• How many analog output channels are provided?

  The 1771-OFE1/B provides four isolated analog output channels. Each channel is intended to generate a selectable voltage signal.

• What voltage ranges are supported?

  The supplied data lists 1-5 VDC, 0-10 VDC, and +/- 10 VDC ranges, with corresponding output ranges of +1 to +5 VDC, 0 to +10 VDC, and -10 to +10 VDC.

• What is the module resolution?

  The specified module resolution is 12 bits. The supplied information does not provide separate accuracy or linearity specifications.

• What data formats are supported?

  The supplied product information identifies BDC and Natural Binary as supported data formats for the module.

• What is the specified backplane current?

  The specified backplane current is 1.5 mA. This is the module's stated backplane current requirement and is separate from the analog field output current.

• Does the module provide current outputs?

  No current range is specified. The supplied information identifies voltage outputs and lists the current range as N/A.

• Are the four output channels isolated?

  Yes. The product information explicitly identifies four isolated channels. The supplied data does not specify the isolation voltage rating.

• Is hot-swapping supported?

  Hot-swap capability is not stated in the supplied data. Installation or removal should therefore be performed with power removed unless the applicable PLC-5 documentation explicitly permits energized replacement.