The Omron CJ1W-DA021, also cataloged as the CJ1W-DA021 Special I/O Unit, operates as a dedicated hardware component for converting 16-bit binary digital values into precise analog output signals within CJ Series backplane architectures.

Functional Configuration & Signal Mapping

• Output Capacity: Features 2 independent analog output channels with a conversion resolution of 1/40,000.
• Signal Ranges: Configurable per channel for 1 to 5 V, 0 to 5 V, 0 to 10 V, -10 to 10 V, and 4 to 20 mA outputs.
• Circuit Isolation: Photocoupler isolation separates internal controller signals from field I/O terminals, with no isolation between individual analog output channels.

Technical Specifications

High-Speed Backplane Synchronization & Execution

Internal digital-to-analog conversion logic maps directly to system memory across optimized backplane bus communication velocity Licences. High-density scaling algorithms ensure rapid output updates during active PLC execution scans. Photocoupler signal separation preserves internal logic processing circuits, while hardware flash compatibility guarantees uniform conversion timing across varying controller baseplate setups.

Shipping Package Contents

• 1 x Omron CJ1W-DA021 Analog Output Module
• 1 x 18-point Detachable Terminal Block (M3 Screws)
• 1 x Product Instruction Leaflet

Field Installation & Wiring Guidelines

• Rack Mounting: Insert the module into the CJ Series backplane slot until top and bottom mounting clips securely latch into place.
• External Power Connection: Supply external 24 VDC (+10% / -15%) auxiliary power to dedicated terminal block points to power output drive circuitry.
• Signal Cabling: Use twisted-pair shielded cables for all analog voltage and current loops to suppress electromagnetic interference.
• Shield Termination: Ground signal wire shielding at the module ground terminal using a short wire stub, keeping ground resistance below 100 ohm.

Frequently Asked Questions

• What signal ranges can be configured on the analog output channels?

  Outputs can be set independently for 1 to 5 V, 0 to 5 V, 0 to 10 V, -10 to 10 V, and 4 to 20 mA across both channels.

• What is the conversion resolution capability of this module?

  The unit delivers a high-precision digital-to-analog conversion resolution of 1/40,000 using 16-bit binary set data.

• What external power source is required to drive the output channels?

  An external supply of 24 VDC (+10% / -15%) drawing up to 140 mA is required for field circuit operation.

• How much current does the unit draw from the internal 5 VDC backplane?

  The module consumes a maximum current load of 120 mA from the internal 5 VDC backplane power supply rail.

• Is there channel-to-channel electrical isolation between the 2 outputs?

  No, photocoupler isolation is provided between field I/O and the backplane controller logic, but not between individual output channels.

• What terminal connection format is used for external signal wiring?

  Field wiring attaches to an 18-point detachable terminal block secured with standard M3 screw connectors.

• What is the maximum allowable load resistance for current output mode?

  When configured for 4 to 20 mA current output, the maximum permissible load resistance is strictly 600 Ohm.

• Is hot-swapping supported when detaching the terminal block?

  No, external 24 VDC power and backplane supply must be de-energized before removing the module or terminal block.