GE IC693ALG221B Analog Input Module

Configured for converting analog current signals into 12-bit digital values in Series 90-30 PLC systems, the GE Fanuc IC693ALG221B (IC693ALG221 Analog Input Module) provides direct physical/electrical execution.

Hardware Specifications

I/O Density Scaling & Backplane Bus Execution

• Digital Conversion & Scaling: Converts analog current inputs into internal numeric values from 0 to 32000 in %AI registers, maintaining linear scaling across 4-20 mA and 0-20 mA operational spans.
• Backplane Bus Performance: Transmits sampled data through optical isolation barriers to the Series 90-30 backplane bus every 2 ms, operating within firmware flash compatibility constraints of the host CPU.
• Hardware Range Jumpering: Utilizes physical shorting jumpers on the removable terminal block (one jumper for Channels 1-2, one jumper for Channels 3-4) to determine hardware loop configurations without altering backplane software settings.

Frequently Asked Questions

Q: How is the operational current range switched from 4-20 mA to 0-20 mA on the IC693ALG221B?

A: Current range selection is accomplished via physical hardware jumpers located on the removable terminal block. Shorting specific terminal pairs configures channels 1-2 or channels 3-4 from the default 4-20 mA range to 0-20 mA.

Q: What register counts correspond to the default 4-20 mA current range?

A: An input signal of 4 mA yields a register count of 0, whereas 20 mA yields a count of 32000. Signal variations scale linearly between these boundary values at 4 uA per LSB.

Q: What backplane current limits must be budgeted for this module?

A: The IC693ALG221B requires 25 mA from the 5 VDC backplane supply for logic circuits and 100 mA from the isolated 24 VDC backplane rail to power the internal analog conversion circuitry.

Field Installation Guidelines

1. Wiring and Cable Selection: Route field input signals using twisted-pair, shielded cables to limit capacitive loading and stray electromagnetic noise.
2. Shield Grounding: Terminate cable shielding at a single ground connection on the enclosure ground bar or frame ground point to prevent ground loops.
3. Range Jumpering: Ensure physical jumpers across the terminal block are seated before energizing loops when 0-20 mA range scaling is required.
4. Physical Installation: Align the module with the card guide slot in the Series 90-30 rack and push until upper and lower locking levers snap securely into position.