GE HE670ADC830 Input Module

The GE HE670ADC830, also cataloged as the HE670ADC830 Analog Input Module, operates as a dedicated hardware component for multi-channel voltage signal acquisition and analog-to-digital conversion within GE Fanuc Field Control automation system networks.

Hardware Specifications

Channel-to-Channel Isolation and Differential Performance

Configured to maintain signal integrity in electrically noisy process environments, the module features robust galvanic isolation engineered at 400 VDC channel-to-channel and 1000 VDC channel-to-backplane. This isolation architecture prevents ground loops, common-mode voltage offset propagation, and cross-talk suppression failures across all 8 voltage input channels. High-input impedance of 1 Mohm minimizes loading effects on field transmitters, while the onboard 12-bit ADC delivers linear conversion (up to +/- 10,000 counts) across backplane bus communication structures via the host Bus Interface Unit (BIU).

Frequently Asked Questions

Q: How is the input voltage range (0 to 10 VDC vs -10 to +10 VDC) configured for this module?

A: The input voltage range selection and output scaling formats are configured remotely via parameters set in the host Bus Interface Unit (BIU) during network setup.

Q: What power source drives the internal analog conversion electronics?

A: The module draws 130 mA directly from the backplane power rail, while requiring an auxiliary 24 VDC (+/- 10%) field input supply for module operation.

Q: What is the digital count resolution provided by the internal converter?

A: The module utilizes a 12-bit resolution architecture (11 magnitude bits plus 1 sign bit), which scales a full 10 VDC input signal into a standard digital output of 10,000 counts.

Field Installation Guidelines

1. Base Assembly Integration: Mount the module into its designated slot on the standard Field Control I/O base terminal unit. Ensure the backplane interface pins align completely before snapping the module housing lock mechanisms into place.
2. Signal Wiring and Shielding: Connect analog field inputs using individual shielded twisted-pair cables to prevent electromagnetic coupling. Ground cable shields at a single point (typically the cabinet ground bar or BIU earth terminal) to eliminate ground loop currents.
3. Power Isolation Precautions: Verify that external 24 VDC power wiring complies with NEC Class 2 standards. Keep signal lines segregated from AC power conductors and high-current inductive motor wiring within cable trunks to ensure continuous acquisition accuracy.