GE HE693DAC420 Isolated Analog Output Module

Technical Specifications

• Model: HE693DAC420

• Series: GE Series 90-30

• Number of Channels: 4 isolated analog output channels

• Output Type: Analog current

• Output Range: Software-configurable for 4-20 mA or 0-20 mA per channel

• Digital-to-Analog Resolution: 13 bits plus sign, providing 14-bit resolution

• Resolution Details:

  • 2.0 µA per bit in 4-20 mA mode

  • 2.5 µA per bit in 0-20 mA mode

• Maximum Linearity Error:

  • 0.10% of full scale for the 4-20 mA range

  • 0.15% of full scale for the 0-20 mA range

• User-Supplied Loop Voltage: 3 to 32 VDC

• Maximum Load Impedance: 1.1k ohms at a 24 V loop voltage

• Power Consumption:

  • 90 mA at 5 VDC

  • 120 mA at 24 VDC from the PLC backplane

• Surge Current on Power-Up:

  • 250 mA for 10 ms at 5 VDC

  • 900 mA for 30 ms at 24 VDC

• Isolation Specifications:

  • Channel-to-Channel: 1500 VAC (RMS), ±2000 VDC

  • Common Mode Isolation: 500 VAC (RMS), ±2000 VDC

• I/O Registers Required: 4 analog output words (%AQ)

• Operating Temperature: 0 to 60°C

• Relative Humidity: 5% to 95%, non-condensing

Key Functional Features

• Configurable “Last State” Operation: Each channel can be individually configured to either “hold its last state” or “default to 4/0 mA” when the PLC transitions out of RUN mode. This feature provides predictable and safe behavior during system stoppages .

• High-Resolution Control: The 14-bit resolution ensures smooth and precise analog signal generation, which is critical for fine-tuning the position of control valves or the speed of variable frequency drives .

• Robust Channel Isolation: With 1500 VAC (RMS) isolation between channels and to ground, the module eliminates ground loop interference and protects the control system from damaging transient voltages, ensuring signal integrity in harsh environments .

• Versatile Loop Power Support: The module accepts a wide range of user-supplied loop voltages from 3 to 32 VDC, allowing direct connection to various field instruments and indicators without the need for external signal conditioners .

• Fast Conversion Time: Features an analog-to-digital conversion time of less than 2 milliseconds, enabling responsive control for high-speed automation processes .

Application Scenarios

• Process Control in Energy Sectors: Deployed in oil, gas, and petrochemical plants to precisely modulate control valves, regulating critical variables such as pipeline pressure and reactor flow rates .

• Power Generation and Utilities: Used within power plants for controlling boiler feed water valves, steam turbine governors, and other actuators essential for stable power output and grid synchronization .

• Discrete and Continuous Manufacturing: Applied in chemical, pulp & paper, and textile industries to drive motor speed controllers, heating elements, and other analog-controlled equipment on automated production lines .

• Water and Wastewater Treatment: Integrates into SCADA and PLC systems to manage chemical dosing pumps and flow control valves, ensuring precise water quality monitoring and treatment processes .