1771-NOV PLC 5 Analog I/O Module | Allen-Bradley

Configured for precise voltage regulation in PLC 5 control networks, the Allen-Bradley 1771-NOV (1771-NOV N-Series Analog I/O Module) provides direct physical/electrical execution of 8-channel analog output signaling.

Suffix Breakdown & Model Matrix

• 1771-NOV: Base module unit designed for rack-mounted PLC 5 chassis integration.
• 1771-RTP4: Optional unfused Remote Terminal Panel for standard output distribution.
• 1771-RTP3: Optional fused Remote Terminal Panel for circuit protection on output channels.
• 1771-WH: Compatible standard wiring arm required for interface connection.

Hardware Specifications

Profinet / EtherNet/IP Deterministic Networks

The 1771-NOV interfaces with the PLC 5 backplane to manage analog output signals via BCD or natural binary data formats. The module utilizes high-speed backplane bus communication velocity to ensure deterministic signal updates. Users must ensure that the firmware flash compatibility of the host processor is verified for N-Series module support to prevent timing inaccuracies. Given the high backplane current demand of 2.1 A, proper I/O density scaling calculations are mandatory when configuring the chassis power budget to avoid voltage sag and communication timeouts.

Frequently Asked Questions

Q: Does the 1771-NOV module support hot-swapping during processor operation?

A: No. The 1771-NOV does not support hot-swapping. The host rack must be de-energized prior to removing or installing the module to protect the backplane pins from electrical arcing.

Q: How is the output resolution of 1.32 mV/bit maintained across the +/- 10 VDC range?

A: The resolution is a function of the internal digital-to-analog converter (DAC) bit depth. The conversion accuracy assumes proper shielding of the signal output to prevent electromagnetic interference from inducing ripple or noise onto the analog loop.

Field Installation Guidelines

1. Power down the PLC 5 rack and verify zero potential across the backplane terminals before beginning installation.
2. Install the module into the designated slot, ensuring firm engagement with the rack backplane connectors.
3. Select the appropriate Remote Terminal Panel (1771-RTP3 for fused or 1771-RTP4 for unfused) based on the circuit protection requirements of the target load.
4. Utilize the 1771-WH wiring arm for all terminations, ensuring proper torque on terminal screws to maintain low contact resistance.
5. Terminate all output cable shields to a single, dedicated earth ground at the cabinet entry point to prevent ground loop noise common in analog signaling.
6. Verify output voltage scaling in the PLC programming software after power-up; confirm that the output maps correctly to the expected voltage range.