IC693ALG391 GeneralElectric Fanuc Central control module

Description

IC693ALG391 GeneralElectric Fanuc Central control module

Product Dimensions：

Product Description

The IC693ALG391 provides two output channels, each capable of converting 12 bits of digital data into an analog current signal. The module is “intelligent,” meaning it performs its own digital-to-analog conversions and reports its status back to the CPU. It is typically powered by the $+24$ VDC isolated power provided by the PLC backplane power supply (like the IC693PWR321).

Product Parameters

Key parameters for the IC693ALG391 include:

Key Advantages

• High Precision: With 12-bit resolution, it allows for very fine adjustments in process control (e.g., opening a valve by 0.1%).

• Loop Integrity: The module can be configured to hold its last state or default to a specific value if the PLC stops, ensuring process safety.

• Easy Configuration: No jumpers are required for most settings; it is primarily configured through the GE Fanuc software (Proficy Machine Edition or Logicmaster 90).

• Robust Isolation: Protects the sensitive PLC CPU from electrical surges or “noise” originating from the field devices.

Important Precautions

1. External Power Requirement: While it can draw power from the backplane, it often requires an external $+24$ VDC power supply to maintain the current loop, especially if driving high-impedance loads.

2. Shielding: To prevent signal interference, use shielded twisted-pair cable and ground the shield at only one end (usually the PLC end).

3. Slot Placement: Ensure the module is firmly seated in the baseplate. It can be placed in any I/O slot, but power consumption should be calculated to avoid overloading the rack power supply.

4. Open Loop Detection: Be aware that if a wire breaks in the 4-20 mA loop, the module will report a value of 0, which the PLC logic must be programmed to handle as an error.

Product Applications

This module is essential for applications requiring variable control rather than simple “On/Off” commands:

• Proportional Valve Control: Precisely adjusting fluid flow in chemical or water treatment plants.

• Variable Speed Drives (VSD): Sending a 4-20 mA signal to a motor drive to control rotation speed.

• Process Heating: Controlling the output of power controllers for industrial ovens.

• Actuators: Positioning dampers in HVAC systems or industrial dampers in power plants.