GE Qualitrol IC670ALG230 Analog Input Module

+24 V Out ": 8 channels of shared 24 V output (with fuses), providing loop power for 2-wire transmitters;

Input 1-8 ": 8-channel current signal input terminal;

DC - "/" Common ": The signal common terminal needs to be connected to the sensor signal ground to avoid grounding loops;

Chassis Ground ": The module casing ground needs to be short circuited to the control cabinet casing to enhance anti-interference capability.

On site wiring and sensor adaptation

The module supports 2-wire, 3-wire, and 4-wire sensors/transmitters, and the wiring method needs to be selected according to the sensor type. The key configurations are as follows:

（1） 2-wire transmitter (loop power supply)

Wiring characteristics: The sensor power supply and signal share two wires. The module "+24 V Out" provides circuit power, "Input" receives current signals, and "DC -" is the common terminal;

Attention: AWG # 14- # 22 (cross-sectional area 0.36-2.1 mm ²) should be used as the wire, and the recommended maximum wiring distance should not exceed 100 meters (to avoid voltage drop causing insufficient sensor power supply); The shielding layer needs to be grounded separately and not shared with the power supply ground.

（2） 3-wire transmitter (independent power supply+signal)

Wiring characteristics: The sensor requires separate power supply (module "+24 V Out" or external power supply can be used), the signal terminal "+" is connected to module "Input", "-" is connected to "DC -", and the power supply "-" and signal "-" are grounded together;

Adaptation scenario: For sensors that require higher power supply voltage or current (such as some high-precision temperature transmitters), it is recommended to use an auxiliary terminal block to consolidate the common terminal and simplify wiring.

（3） 4-wire transmitter (completely isolated)

Wiring characteristics: The sensor power supply is completely isolated from the signal (independent external power supply), the signal "+" is connected to "Input", "-" is connected to "DC -", and the power ground and signal ground are separated to avoid ground loop interference;

Advantages: Suitable for long-distance (such as over 200 meters) or strong interference scenarios (such as near frequency converters), isolation design improves signal stability.

（4） Wiring specifications

Wire selection: It is recommended to use shielded twisted pair for analog signals, with the shielding layer grounded at one end (preferably on the module side);

Grounding requirements: Only ground the signal common terminal on the module side to avoid multiple grounding points forming a ground loop; The module 'Chassis Ground' needs to be connected to the control cabinet casing with a short wire (recommended<4 inches, # 14 wire);

Auxiliary terminal block: When using fence type terminals or wire to board connectors, auxiliary terminal blocks (such as IC670CHS series) should be used to expand the wiring terminals. All terminals inside the auxiliary terminal block are connected and can be used to summarize the common terminal or power terminal.

Software Configuration and Data Processing

（1） Parameter configuration

The module needs to be parameterized through a Bus Interface Unit (BIU) or host software, with the following key configuration items:

Input range: Each channel is independently configured with 0-20 mA or 4-20 mA, with a default range of 0-20 mA;

Engineering unit scaling: defined by BIU as "Engineering Lower Limit (Eng Lo) - Engineering Upper Limit (Eng Hi)" and "Integer Lower Limit (Int Lo) - Integer Upper Limit (Int Hi)", default scaling is Eng Lo=0, Eng Hi=20000 (corresponding to 0-20 mA), Int Lo=0, Int Hi=20000;

Diagnostic enablement: Enable disconnection diagnosis (triggered by input<2.0 mA) and over range diagnosis (triggered by input>20.5 mA) in 4-20 mA mode.

（2） Data transmission

Data format: 8 inputs correspond to 8 16 bit digital quantities (unsigned integers), stored in the module data buffer, and periodically read by BIU (read cycle depends on system configuration, typically 10-100 ms);

Scaling logic: Taking the mapping of 4-20 mA to 0-100 ℃ as an example, BIU calculates the engineering value according to the following formula:

Engineering value=Eng Lo+Int Hi − Int Lo

Digital quantity - Int Lo × (Eng Hi - Eng Lo) (Example: When the digital quantity is 8000, the corresponding current is 8 mA, and the engineering value is 25 ℃).