Omron CJ1W-DA021 Sysmac CJ1 Series Analog Output Unit

SKU CJ1W-DA021

In stock

12-month warranty
Free returns within 30 days

Manufacturer: Omron
Product No.: CJ1W-DA021
Origin Japan
Product Type: Analog Output Modules
Payment: T/T, Western Union
Weight: 2.0 kg
Dimensions: 11.5 cm x 10.5 cm x 4.5 cm
Shipping port: Xiamen
Warranty: 12 months

Product Description

Description

Designed for direct integration into Sysmac PLC architectures, the Omron CJ1W-DA021 is a high-performance, dual-channel digital-to-analog conversion module. It enables precise control of external actuators, variable frequency drives, and process equipment by converting digital processor values into industry-standard analog signals. The module features robust photocoupler isolation between the internal controller CPU backplane and external field connections, shielding sensitive logic circuits from field-side electrical disturbances. With an integrated 18-point detachable terminal block, maintenance engineers can swap modules without disconnecting field wiring, minimizing operational downtime in continuous process environments.

Key Features

Dual Independent Output Channels: Supports independent configuration for both voltage and current outputs across two distinct field connections.
Multi-Range Flexibility: Software-selectable output signal ranges including 1 to 5 V, 0 to 5 V, 0 to 10 V, bipolar -10 to 10 V, and 4 to 20 mA.
Fail-Safe Output Hold Function: Configurable recovery behavior (CLR, HOLD, or MAX) to preserve, clear, or maximize output signal states if the controller CPU encounters an error or stops executing.
High Resolution: Operates at an industrial-grade conversion resolution of 4,000 (1/4000) for smooth ramp profiles and precise valve positioning.
Detachable Terminal block: 18-point M3 screw terminal layout simplifies cabinet pre-wiring and field module swaps.

Applications

Speed referencing for Variable Frequency Drives (VFDs) and servo controller velocity loops.
Positioning and flow adjustment for pneumatic and hydraulic proportional control valves.
Set-point configuration feed to discrete temperature controller units and recording devices.
Simulating transducer signals during commissioning of remote supervisory control systems.

Technical Specifications

Specification Parameter	Value / Detail
Manufacturer	Omron
Model Number	CJ1W-DA021
Module Type	Analog Output Unit
Number of Outputs	2 channels
Analog Signal Formats	1 to 5 V, 0 to 5 V, 0 to 10 V, -10 to 10 V, 4 to 20 mA
D/A Conversion Resolution	4,000 (16-bit binary data representation)
Conversion Speed	1.0 ms per point
Accuracy (at 25 degC)	Voltage: +/-0.3% of F.S. \| Current: +/-0.5% of F.S.
Accuracy (0 to 55 degC)	Voltage: +/-0.5% of F.S. \| Current: +/-0.8% of F.S.
Isolation Mechanism	Photocoupler isolation between controller backplane and outputs; no isolation between channels
External Power Supply	24 VDC (+10% / -15%), 140 mA max (Inrush: 20 A max, pulse width 1 ms min)
Internal Power Consumption	5 VDC, 120 mA max
Output Impedance (Voltage)	0.5 Ohms max
Max Load Resistance (Current)	600 Ohms max
Country of Origin	Japan
Shipping Weight (Calculated)	0.35 kg
Package Dimensions (Calculated)	11.5 cm x 10.5 cm x 4.5 cm

Connections and Interfaces

The module interface uses an 18-point detachable terminal block setup. Terminal assignments must align strictly with the target signal type to prevent internal component fatigue.

Terminal Connection	Signal Allocation / Function
A1 / B1	External Power Supply Input (+24 VDC / 0 V Ground)
A3 / A4	Channel 1 Voltage Output (+) / Output Common (-)
A5 / A4	Channel 1 Current Output (+) / Output Common (-)
B3 / B4	Channel 2 Voltage Output (+) / Output Common (-)
B5 / B4	Channel 2 Current Output (+) / Output Common (-)

Empirical Engineering Insights

Alternative Models & Compatibility

The CJ1W-DA021 shares form-factor and configuration parameters with standard CJ1, CJ2, and NJ controller backplanes (when utilized with an EtherCAT or EtherNet/IP bus coupler). It serves as a direct drop-in replacement for legacy CJ1W analog variants. However, verify the CPU allocated memory map registers (CIO area), as older program structures might require address validation depending on the unit number assigned via the front-panel rotary switch.

Application Pitfalls & Engineering Notes

Note that there is no electrical isolation between Channel 1 and Channel 2 outputs on this unit; both share a common ground reference (Output Common). If connecting to two field instruments with differing ground references, ground loop currents can corrupt analog signals or damage the output stage. Ensure field instruments have isolated inputs or use external signal isolators to maintain loop integrity.

Commissioning & Wiring Tips

To mitigate electromagnetic interference in high-noise environments (such as proximity to active VFD switchgear), always use shielded twisted-pair (STP) cabling for the analog loops. Ground the cable shield strictly at the PLC enclosure ground panel and leave the instrument end ungrounded to prevent ground loops. Never route analog output cables inside the same wire duct as high-voltage AC power lines.

Installation Guidelines

CRITICAL WARNING: Ensure all power to the PLC rack and the external 24 VDC field supply is completely disconnected before mounting, unmounting, or wiring the module. Hot-swapping the module can cause latch-up conditions or permanent damage to the CPU backplane logic.

Set the Unit Number rotary switch on the front panel of the CJ1W-DA021 using a small flathead screwdriver. This allocation must match the hardware configuration in CX-Programmer or Sysmac Studio.

Mount the module onto the CJ-series backplane, aligning the bottom hook and snapping the top locking mechanism firmly into place. Secure the yellow slide locks to ensure mechanical stability.

Wire the external 24 VDC power supply to terminals A1 (+) and B1 (-) to energize the conversion circuitry, then wire the analog load loops according to the designated voltage or current terminals.

Shipping & Returns

Global Express Shipping

Standard Delivery: 4–6 business days via DHL, FedEx, and UPS.
Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
Worldwide Coverage: Serving over 150 countries.

Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our technical warranty.

FAQ

Is there electrical isolation between output channels on the CJ1W-DA021?

No. While there is photocoupler isolation between the PLC's internal logic and the output circuits, the two analog output channels share a common ground reference. If your field instruments have different ground potentials, you must use external isolation modules.

What happens to the outputs if the CPU goes into Program mode or encounters an error?

The module features an Output Hold function. You can configure each channel via the PLC memory settings to either clear (CLR to offset limit), hold the last converted value (HOLD), or drive to the maximum limit (MAX).

Can I run one channel as a voltage output and the other as a current output?

Yes. Each of the two channels is configured independently via the PLC's memory parameters, allowing you to run different signal ranges (e.g., 4-20mA on channel 1 and 0-10V on channel 2) simultaneously.

Why is the external 24 VDC supply necessary for this analog module?

The 24 VDC external supply powers the internal digital-to-analog converter and the high-power output drivers. The internal 5 VDC backplane power is only used to drive the low-voltage communication logic.

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