Description
IC693ALG221 GE Fanuc Series 90-30 Analog Current Input Module
Product Dimensions：
Product Description (Detailed Explanation)
The IC693ALG221 provides 4 input channels, each capable of converting analog current signals into digital values for the PLC CPU. It is specifically engineered to handle the industry-standard 4 to 20 mA current range.
A key feature of this module is its ability to provide loop power for certain applications, although it is primarily used as a passive receiver. Each channel is converted with high resolution, and the data is refreshed in the PLC’s %AI register memory every scan cycle. It occupies a single slot on any Series 90-30 baseplate (Local, Expansion, or Remote).
Product Parameters (Technical Specifications)
| Parameter Category | Specification |
| Number of Channels | 4 (Single-ended) |
| Input Signal Range | 4 to 20 mA |
| Resolution | 12 bits (4 $\mu A$ per count) |
| Input Impedance | 250 Ohms |
| Update Rate | 5 ms (for all 4 channels) |
| Accuracy | +/- 0.1% of full scale at 25°C |
| Power Consumption | 100 mA from +5V backplane / 25 mA from +24V isolated |
| Linearity | < 1 LSB |
| Isolation | 1500V between field side and logic side |
Product Advantages (Key Benefits)
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High Stability: Precision components ensure minimal drift over time and temperature changes, providing consistent process readings.
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Efficient Scanning: With a 5ms update rate, it is fast enough for most industrial PID loops and real-time monitoring.
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Simplified Wiring: The module uses a standard removable terminal block, allowing for easy pre-wiring or module replacement without disconnecting field leads.
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Galvanic Protection: Robust optical isolation protects the PLC backplane and CPU from field-side electrical surges or ground loops.
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Built-in Filtering: Integrated digital filters help suppress high-frequency noise often found in industrial environments.
Precautions (Important Notes)
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External Power Supply: An external 24V DC power supply is required on the terminal block to power the analog circuitry; the module cannot operate solely on backplane power.
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Common Mode Voltage: Since the inputs are single-ended (sharing a common return), all input signals must originate from the same ground reference to avoid measurement errors.
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Open Loop Detection: If the current drops below 4mA (e.g., a wire break), the reported value will fall below the calibrated minimum. Logic should be written to detect “Under-range” as a fault condition.
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Shielding: Always use Shielded Twisted Pair (STP) cable. Connect the shield at the PLC end to the frame ground (GND) to minimize electromagnetic interference (EMI).
Product Applications (Typical Use Cases)
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Process Instrument Monitoring: Reading data from pressure transmitters, temperature transmitters, and level sensors in chemical or water treatment plants.
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Flow Measurement: Capturing 4-20mA signals from electromagnetic or turbine flowmeters for mass balance or dosage control.
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Feedback Loops: Acting as the “Process Variable” (PV) input for PID control loops governing motor speeds or valve positions.
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Environmental Sensing: Monitoring gas concentration sensors (O2, CO2, LEL) in safety-critical ventilation systems.
Shipping Port: Xiamen, China
Payment: Bank of Chicago, Bank of Singapore
Express cooperation: fedex, DHL, UPS and your express account
Service: Professional Sales provides 24 hours /7 days online service
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