IC695ALG704 Emerson GE PACSystem RX3i Analog Output Module

Emerson GE IC695ALG704 Technical Profile

The Emerson Automation IC695ALG704 (formerly manufactured by GE Intelligent Platforms) is a high-accuracy, single-slot analog output module designed for the PACSystem RX3i control platform. This module provides four non-isolated output channels, configurable for voltage or current loops on an individual channel-by-channel basis.

This module converts digital PLC registers into analog signals (±10 Vdc, 0 to 10 Vdc, 0-20 mA, or 4-20 mA) to drive field actuators. It features a fast 8-millisecond update rate and utilizes high-resolution conversion (up to 15.9 bits) to ensure smooth, step-free modulation. Field wiring connects through compatible box or spring-style terminal blocks, including the IC694TBB032 and IC694TBS032 series.

Global PLC Spare HUB's Insight

The Emerson IC695ALG704 is an industrial standard for process variable replication and modulating control loop execution. Unlike older analog cards that require manual hardware jumpers, this card is entirely software-configured through Machine Edition software. This eliminates physical calibration errors during field deployment.

The module is equipped with a dedicated output protection network that survives sustained overvoltage conditions up to 30 Vdc. It handles both 32-bit floating-point and scaled 16-bit integer data formats, allowing programmers to bypass complex math conversion blocks in the PLC controller logic.

Configuration Breakdown (Part Number Structural Tree)

The hardware and modular configuration of the IC695ALG704 is structured below:

• IC695 — PACSystem RX3i High-Performance Backplane Module Platform
  • ALG — Analog I/O Module Group Classification
  • 704 [This Model] — 4-Channel Non-Isolated Analog Output Module supporting voltage and current ranges
• Compatible Wiring Assemblies (Sold Separately):
  • IC694TBB032: Standard Box-style terminal block
  • IC694TBB132: Extended Box-style terminal block (provides extra depth for shield grounding wires)
  • IC694TBS032: Tactile Spring-style terminal block
  • IC694TBS132: Extended Spring-style terminal block

Target Equipment & Plant Applications

• Pneumatic Control Valves: Modulating continuous positioners on steam header and feed-water valve loops.
• Variable Frequency Drives (VFDs): Transmitting speed and torque reference signals directly to drive terminals over 4-20 mA loops.
• Damper and Louver Actuators: Controlling combustion air and exhaust flow dampers in industrial boiler systems.
• Signal Distribution Networks: Providing reconditioned isolation outputs to feed external paper chart recorders and data loggers.

Diagnostic Capabilities & Signal Integrity

• Advanced Alarm Processing: Monitors and latches critical operational errors, reporting high-high, high, low, and low-low parameter violations.
• Active Hardware Protection: Provides robust overvoltage protection of -30 Vdc for up to 60 seconds and +30 Vdc for up to one hour.
• Auto-Calibration Routines: On-board background diagnostics continuously adjust for thermal component drift, maintaining a 0.15% full-scale accuracy at 25°C.

Technical Specifications Table

Global Logistics, Delivery & Warranty Terms

• Courier Networks: Priority global transit handled via express services DHL, FedEx, and UPS loops.
• Dispatch SLA: In-stock units are securely packaged and shipped within 24 to 48 hours of verification.
• Warranty Terms: Provided with a complete 12-month replacement warranty from Global PLC Spare HUB.

Strategic Procurement & Selection Guide

• CPU Firmware Verification: The IC695ALG704 requires an RX3i CPU with firmware version 3.0 or later. Confirm your host CPU firmware level before hot-swapping or installing this module.
• External Power Routing: This module requires an external +24 Vdc power supply to drive its analog outputs. This power cannot be drawn from the universal backplane TB1 connector; wire it directly to the module's terminal block.
• Terminal Block Depth Selection: When using heavy-gauge shielded cable, choose the extended depth terminal blocks (IC694TBB132 or IC694TBS132). The extra space simplifies shield wire routing and helps prevent physical cabinet crowding.

Industrial Frequently Asked Questions (FAQ)

Q: What happens to the analog outputs if the RX3i CPU goes into STOP mode or loses communication?

A: Through Machine Edition, you can configure each channel to either hold its last state or ramp down to a designated safe value (such as 4 mA or 0 V). This feature helps protect downstream equipment during system faults.

Q: Why are there four separate analog resolution specifications listed for the same card?

A: The internal digital-to-analog converter (DAC) spans a fixed bipolar range. When you configure the channel to a unipolar range (such as 0-10 Vdc or 4-20 mA), the resolution adjusts to maximize accuracy over that narrower span.

Q: Does this module support HART protocol communication with smart field instruments?

A: No. The IC695ALG704 does not support HART pass-through communication. For smart instrument management, select a dedicated RX3i HART analog card.

Q: My field actuator has a high input impedance. Can I still drive a current loop using this card?

A: Yes. The module can drive current loops with total loop resistance up to 850 Ohms. To maintain stable current output, ensure your field cabling and actuator impedance do not exceed this limit.

Q: How do I perform a firmware upgrade on the IC695ALG704 module if my CPU does not have a serial port?

A: If your CPU lacks a serial interface for the WinLoader utility, you can perform the upgrade using the web-based tool provided in the firmware upgrade kit. Follow the network instructions included in the firmware package.

Tags