8-Channel Analog Output Module | GE IC695ALG808 PACSystems RX3i

GE IC695ALG808 PACSystems RX3i Analog Output Module

The GE IC695ALG808, also cataloged as the IC695ALG808 Analog Output Module, operates as a dedicated hardware component for converting digital processing values into precise field control signals within PACSystems RX3i platforms. The single-slot module provides eight individually configurable channels capable of driving voltage (+/-10 VDC, 0-10 VDC) or current (0-20 mA, 4-20 mA) loops. Utilizing a PCI backplane bus architecture, the unit executes an 8 ms full-channel update rate while maintaining optical channel-to-channel isolation to prevent ground loop currents.

Hardware Specifications

Firmware Flash Compatibility and Backplane Bus Speed

The GE IC695ALG808 leverages high-speed PCI bus communications to maintain deterministic updates across all eight analog channels within an 8 ms scan window. High-density I/O scaling allows engineers to populate multiple analog output blocks across the PACSystems RX3i rack backplane without degrading control loop performance. Onboard firmware flash compatibility enables seamless module configuration updates via Machine Edition software, preserving pre-set clamp limits, ramp rates, and fault state behaviors during system reboot cycles.

Frequently Asked Questions

Q: How does the module handle backplane power distribution during full operational loading?

A: The module draws logical power from the RX3i backplane via 3.3 VDC (250 mA) and 5 VDC (17 mA) rails, while requiring a dedicated external 24 VDC power supply (660 mA) to energize the loop output circuitry.

Q: Can channels be hot-swapped during live backplane operation?

A: Hot insertion and removal (hot-swapping) are supported on PACSystems RX3i universal backplanes, provided the field terminal block is unclipped or isolated to prevent voltage transients on adjacent channels.

Q: What diagnostic capabilities exist for identifying field wiring faults?

A: The module provides onboard channel-level diagnostics that monitor for overrange, underrange, and open-wire conditions, triggering soft alarm bits across the PCI backplane bus.

Field Installation Guidelines

Observe the following field engineering practices during installation and commissioning:

1. Power Isolation & Rack Slotting: Turn off external 24 VDC field supply voltages before attaching field wiring blocks. Seat the module securely into any standard RX3i universal backplane slot until the top and bottom chassis latches engage.
2. Shielded Field Cabling: Route analog current and voltage wires using individually shielded twisted-pair cables. Run output wiring through dedicated low-voltage cable raceways, maintaining separation from high-voltage AC motor drives to minimize inductive noise.
3. Grounding & Cable Shield Termination: Connect single-ended cable shields to the nearest cabinet earth ground bar. Maintain the factory channel-to-channel isolation barrier by avoiding interconnected shield drains at the field device end.
4. External Power Supply Wiring: Connect a regulated 24 VDC power source to the module's external power terminals, ensuring correct polarity to maintain loop driver regulation and prevent thermal trip conditions.
5. Cabinet Convection Spacing: Ensure top and bottom panel ventilation slots remain clear by maintaining a minimum vertical clearance of 50 mm, holding the ambient enclosure environment within the 0 to +60 deg C operating threshold.