IC695ALG808 GE Fanuc PACSystems RX3i 8-Ch Isolated Analog Output Module

Product Overview

The IC695ALG808 is an 8-channel high-density isolated analog output expansion module manufactured by Emerson Automation (formerly GE Fanuc / GE Intelligent Platforms) for the PACSystems RX3i Series. Designed for precise process control, this module provides channel-to-channel and channel-to-backplane galvanic isolation. Each channel is software-configurable for current outputs (0–20 mA, 4–20 mA) or voltage outputs (0 to +10V, ±10V), enabling direct interface with modulating field actuators, control valves, variable frequency drives (VFDs), and remote data recorders.

Technical & Electrical Specifications

System Interconnects & Mechanical Design

Target Applications & Hardware Diagnostics

The IC695ALG808 is routinely specified in oil and gas refineries, water treatment plants, and thermal processing cells where ground loop noise threatens signal integrity. Front-panel LEDs streamline fault detection: a solid Green "Module Status" confirms normal logic communication, while an Amber "Field Status" alerts engineers to missing 24VDC external power or broken field loop wiring. Software alarms (Very Low, Low, High, Very High) can be latched to trigger fault reporting in the controller CPU prior to system trips.

Global PLC Spare HUB's Insight

Channel-to-channel isolation on the IC695ALG808 eliminates the common-mode potential differences that often ruin analog drive commands in heavy industrial environments. However, field engineers frequently overlook the external power requirement: even if the backplane 3.3V power is fully functional, the analog output DAC drivers will not operate without an independent, clean 24VDC loop supply wired directly to the terminal block. Ensuring the external supply stays above 19.2 VDC under maximum load (1350 Ohms per channel) prevents unexpected output clipping.

Model Selection Comparison & Technical Recommendations

Review output density and isolation criteria within the PACSystems RX3i Series analog module family:

• Fully Isolated 8-Channel Module: The IC695ALG808 provides individual channel-to-channel isolation (2550 VDC), ideal for driving ungrounded or long-distance field actuators without cross-channel signal interference.
• Non-Isolated / Group-Isolated Options: For dense cabinets where all actuators share a common ground reference, non-isolated analog output modules offer cost efficiency but sacrifice individual ground-loop protection.

Engineering Selection Tip: When driving precision VFD speed references, set the module data format to 32-bit IEEE Floating Point in PME (PAC Machine Edition). This avoids scaling loss and allows direct engineering unit entry (e.g., 0.0 to 100.0% valve opening) directly from application logic.

Warranty, Logistics & Fulfillment Commitments

• Condition & Authenticity: 100% Original Factory Sealed product in original packaging
• Warranty Terms: Covered by a comprehensive 12 Months functional warranty
• Order Handling Speed: Dispatched within 24 to 48 hours from order confirmation
• Global Express Courier: Direct worldwide shipping via FedEx, UPS, and DHL

Frequently Asked Questions (FAQ)

Q: How do I configure an individual channel for 4–20 mA current versus ±10V voltage output?

A: Output ranges are assigned per-channel inside Proficy Machine Edition (PME) hardware configuration without setting physical hardware jumpers on the module board.

Q: What happens to the analog outputs if communication with the RX3i CPU is temporarily interrupted?

A: Channels can be programmed in software to either hold their last state or default to a predefined safety value (e.g., 0 mA or 4 mA) upon loss of CPU communications.

Q: Can I use this analog output card without connecting an external 24 VDC power supply to the terminal block?

A: No, the 3.3 VDC backplane bus only powers logic interface components; the analog output DAC stages require an external 19.2 to 30 VDC field supply.

Q: What is the maximum load resistance supported when driving a 4–20 mA current loop?

A: The module handles loop impedances up to 1350 Ohms at nominal 24VDC input power, allowing long field cable runs to remote modulating valves.

Q: How can a technician field-verify output accuracy without disconnecting the process actuator?

A: Force a known engineering value (e.g., 50% / 12 mA) via controller software and measure current inline with a calibrated digital multimeter at the removable terminal block.

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