IC697ALG321 GE Series 90-30 Analog Input Module

GE IC697ALG321 Analog Input Module

Configured for high-precision analog-to-digital conversion in GE Series 90-30 PLC platforms, the GE IC697ALG321 (IC697ALG321 Analog Input Module) provides direct physical/electrical execution. The module receives unipolar and bipolar voltage signals from field transmitters, converts these inputs via an onboard 12-bit analog-to-digital converter, and writes the resulting data directly to the CPU memory structure in a 2’s complement format. System engineers configure low/high alarm limits, channel parameters, and scan modes using software tools, which store configuration records directly inside the CPU non-volatile memory.

Hardware Specifications

Backplane Bus Communication Velocity & Channel Isolation

The IC697ALG321 module leverages the internal backplane bus to execute high-speed cyclic data transfer directly into the PLC processor memory blocks. The onboard multiplexer sequentially routes field signals through an optical isolation barrier to preserve signal integrity and eliminate ground loops between field wiring and internal bus architecture. To maximize execution speed, the backplane bus driver streams the 12-bit converted values (formatted inside 16-bit integer registers) without CPU processing overhead, enabling real-time loop updates for process control algorithms.

Frequently Asked Questions

Q: How does the IC697ALG321 format converted analog input signals for the main processor?

A: The onboard 12-bit converter transforms incoming analog voltage signals into digital representation and places the result into a 16-bit word utilizing 2’s complement format. The module transfers this data directly across the backplane bus into designated CPU registers.

Q: Can an operator configure active scanned channels using a handheld programmer?

A: No, field technicians must use Logicmaster software or MS-DOS configuration tools to modify active scanned channel settings, because the handheld programmer cannot configure active scanned channels on this module.

Q: How does single-ended wiring differ from differential wiring regarding signal filtering?

A: The internal input filter maintains a response frequency cutoff of 41 Hz during single-ended operational mode, whereas differential operational mode increases the filter response frequency cutoff to 82 Hz.

Field Installation Guidelines

1. Power down the PLC rack before inserting or removing the module; field personnel must disengage main backplane power to prevent hardware damage.
2. Align the module card edges carefully with the chassis plastic guides and slide the unit firmly into the target slot until the rear connector seats fully into the backplane receptacle.
3. Route all analog signal field cables through grounded metal conduits, separating instrument wiring from high-voltage AC power lines by a minimum distance of 300 mm.
4. Terminate signal cable drain wires at the enclosure grounding bar, while ensuring field sensor ends remain floating to prevent ground loops.
5. Verify screw terminals achieve full engagement (minimum 5 full thread turns) to maintain secure electrical contact and mechanical stability under high-vibration conditions.