Description
Product Introduction
The GE Fanuc IC697ALG230 is an 8-channel high-speed differential analog input module built for heavy-duty process control within Series 90-70 PLC systems. Occupying a single slot on an IC697 VME-based rack backplane, it converts field analog signals—such as 4–20 mA loop currents, 0 to +10 VDC, or ±10 VDC signals—into 12-bit binary representation for CPU processing.
Engineered for high noise immunity and fast scan rates, the IC697ALG230 uses high-performance differential inputs to eliminate common-mode ground noise across long wire runs. Channels can be individually configured via software or jumpers depending on board hardware revisions, making it a reliable solution for feedback loops in legacy industrial plant architectures.
Key Technical Specifications
| Parameter | Value |
| Number of Channels | 8 differential channels |
| Input Ranges (Voltage) | ±10 VDC, 0 to +10 VDC, ±5 VDC, 0 to +5 VDC |
| Input Ranges (Current) | 4 to 20 mA, 0 to 20 mA, ±20 mA (requires precision resistor) |
| Converter Resolution | 12-bit binary (1 part in 4096) |
| Update Rate / Conversion Time | Approx. 1 ms per channel (8 ms total module scan) |
| Common-Mode Range | ±11 Volts peak relative to logic ground |
| Input Impedance | > 10 MΩ (Voltage Mode) |
| Module Isolation | 1500 VAC field-to-backplane optical isolation |
| Power Consumption | Draws power from +5 VDC logic bus on Series 90-70 backplane |
| Backplane Standard | VMEbus architecture (Series 90-70 Rack) |
Application Scenarios & The “Trench” Experience
When an analog input module fails in a continuous processing plant, critical telemetry drops instantly. Controllers lose visibility over pressure headers or temperature loops, forcing safe-state shut downs or dumping active chemical batches.
- Paper & Pulp Mills – Sampling tension feedback load cells and hydraulic pressure feedback across high-speed paper machinery.
- Metals & Steel Stamping – Reading hydraulic ram displacement transducers and pressure transducers in high-cycle press lines.
- Power Plant DCS Systems – Monitoring boiler feedwater loop currents (4–20 mA) and steam pressure transmitters across Series 90-70 control nodes.
Field Case Study: A rolling mill experienced intermittent signal jumps on a main hydraulic feedback line, causing automated thickness rollers to drift off specification. Technicians traced the issue to degraded differential multiplexer channels on an aging IC697ALG230 card. Swapping in a pre-tested surplus IC697ALG230 and transferring the terminal block restored rock-solid 12-bit feedback readings within 20 minutes, avoiding an extended mill shutdown.
IC697ALG230
IC697ALG230
Transparency SOP: Quality Assurance & Testing
Testing legacy VME-bus Series 90-70 components requires proper rack infrastructure and real-world signal injection.
- Inbound Mechanical Inspection: Inspect VME pin connectors, front latch levers, terminal board screws, and verify OEM serial labels and revision marks.
- Backplane Handshake: Install the module into a live Series 90-70 VME rack powered by an IC697 CPU and verify slot recognition in hardware configuration.
- Precision Signal Calibration: Inject calibrated 4.00 mA, 12.00 mA, and 20.00 mA current signals using a Fluke process calibrator across all 8 differential channels.
- Voltage Range Verification: Test ±10 VDC and 0–10 VDC input tracking, checking 12-bit digital register outputs for linear conversion without bit-flicker or gain drift.
- Anti-Static Packaging: Clean VME connector pins, seal the module in an ESD shielding bag with fresh desiccant, and package inside dense foam-padded boxes.
The Veteran’s Tech Trap Guide (Crucial Value-Add)
⚠️ This Card Belongs to the Legacy Series 90-70 (VME) Family! The IC697ALG230 uses the larger VME form factor designed for Series 90-70 racks. It CANNOT be installed into Series 90-30 or PACSystems RX3i chassis! Verify your rack series before purchasing.
❗ Check Your 250-Ohm Shunt Resistors for Current Loops! When wiring 4–20 mA process loops, double-check whether your specific hardware revision relies on internal software-switched shunts or external 250-ohm precision resistors across the terminal block. Applying loop current to a channel without the 250-ohm resistor in circuit will read full-scale saturation or trigger an out-of-range fault!
⚠️ Watch Common-Mode Voltage Limits! While differential inputs reject ground noise, the maximum common-mode voltage between any input signal and frame ground must NOT exceed ±11 VDC. Dips or spikes beyond this threshold will saturate the input operational amplifiers and skew readings across adjacent channels.
Frequently Asked Questions (FAQ)
Q: What is the main difference between single-ended and differential inputs on the IC697ALG230?
A: The utilizes 8 differential channels, meaning each input uses two signal leads (+ and -) to measure voltage drop directly across the sensor. This isolates the measurement from ground noise and voltage offsets common in long field cable runs.
Q: Can I mix 4–20 mA current inputs and 0–10 VDC voltage inputs on the same card?
A: Yes. Channels can be independently configured in software/hardware for either voltage or current modes depending on field transmitter requirements.
Q: Is the hot-swappable while the 90-70 rack is powered?
A: No. Series 90-70 VME racks do not support hot-plugging I/O cards. Always switch off power to the rack chassis before pulling or inserting the module to prevent backplane bus damage.
Q: Is the still manufactured by GE / Emerson?
A: No. The Series 90-70 PLC product line is mature and discontinued by the OEM. High-quality New Surplus and fully bench-tested pre-owned modules are the fastest option for maintaining active systems.
Q: What warranty comes with this module?
A: All new surplus and tested pre-owned modules supplied by our warehouse come with a full 12-month replacement warranty.
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