The Omron CJ1W-AD081-V1, also cataloged as the CJ1W-AD081-V1 Analog Input Unit, operates as a dedicated hardware component for multi-channel analog signal acquisition and analog-to-digital conversion within Omron CJ Series platforms. Configured for high-density physical signal monitoring, this high-resolution Special I/O Unit processes up to 8 independent analog input channels, converting voltage and current process inputs into digital values for real-time PLC backplane processing.

Technical Identifier Matrix

Hardware Specifications

PLC Backplane Bus Velocity and High-Density I/O Scaling

The CJ1W-AD081-V1 utilizes the CJ Series backplane bus to deliver high-velocity data transfer to the main processor without impacting cycle scan times. Operating as a Special I/O Unit, it scales I/O density by providing 8 analog channels in a compact 31 mm backplane slot width. Digital conversion results are continuously mapped into designated Special I/O Unit memory areas, enabling deterministic scan updating across all 8 channels. Integrated firmware functions include mean value processing, peak value holding, and broken-wire detection for 1 to 5 V and 4 to 20 mA ranges.

Package Contents & Ordering Information

• 1x Omron CJ1W-AD081-V1 Analog Input Unit
• 1x 18-Point Detachable Terminal Block Assembly
• 1x Quick Reference Manual Document

Field Installation Guidelines

• Module Mounting: Lock the module onto a 35 mm DIN rail within the CJ Series CPU rack or Expansion rack. Ensure proper insertion into the adjacent backplane connector prior to engaging the slide locks.
• Terminal Wiring: Connect field wiring to the 18-point detachable terminal block using M3 screws. For current inputs (4 to 20 mA), short the V+ and I+ terminals for the respective channel using the supplied terminal jumpers.
• Shielding & Grounding: Use twisted-pair shielded cable for all analog signal paths. Connect the outer cable braid to a 360-deg shield clamp at the panel ground bar and maintain system frame ground (FG) resistance below 100 ohms.
• Backplane Isolation: Do not routed high-voltage AC cables alongside the low-voltage DC analog signal lines. Maintain a minimum clearance distance of 100 mm from power lines.

Frequently Asked Questions

• What signal input ranges are supported by the CJ1W-AD081-V1?

  The module supports 1 to 5 V, 0 to 5 V, 0 to 10 V, -10 to +10 V voltage inputs, and 4 to 20 mA current inputs per channel.

• What is the total conversion speed across all 8 analog channels?

  Total conversion speed is 1.0 ms per active channel at 1/4000 resolution, or 2.0 ms per active channel at 1/8000 resolution.

• Is channel-to-channel isolation provided on the CJ1W-AD081-V1?

  No, inputs are isolated from the PLC backplane via photocouplers, but individual input channels share a common ground reference.

• How are current inputs configured on the terminal block?

  Current input mode requires physically shorting the V+ and I+ terminals for that specific channel on the 18-point terminal block.

• Can individual input channels be disabled if unused?

  Yes, unused channels can be disabled via unit setup memory settings to optimize system conversion time and prevent floating conversion errors.

• Is hot-swapping supported for the CJ1W-AD081-V1 on the backplane?

  No, main power to the PLC power supply unit must be turned off before inserting or removing the CJ1W-AD081-V1 module.

• What wire size is recommended for the detachable terminal block?

  Use stranded copper wiring from AWG 24 to AWG 16 (0.2 to 1.25 mm sq) with M3 ring or spade crimp terminals.

• How does the unit signal a broken wire condition?

  When configured for 1 to 5 V or 4 to 20 mA, an input level below the valid threshold sets a disconnection flag in the Special I/O memory area.