GE Fanuc IC695ALG708-AB Analog Output Module for PACSystems Rx3i

The GE Fanuc IC695ALG708-AB is an 8‑channel analog output module for the PACSystems Rx3i programmable automation controller series. It provides high‑precision 0‑20 mA or 4‑20 mA current outputs with 16‑bit resolution and a fast conversion time of 5 µs per channel. The module includes channel‑to‑channel and channel‑to‑backplane isolation, ensuring signal integrity in electrically noisy industrial environments. It is ideal for controlling actuators, I/P converters, variable speed drives, and chart recorders in process and factory automation. The module mounts in any Rx3i Universal Backplane and is configured using Proficy Machine Edition software.

Technical Specifications

Number of outputs: 8, single-ended. Output ranges: 0‑20 mA or 4‑20 mA (software selectable). Resolution: 16 bits (0.0003% of full scale). Load impedance: 0‑750 Ω. Conversion time: 5 µs per channel (40 µs for all channels). Accuracy: ±0.05% of full scale at 25°C, ±0.1% over temperature range. Drift: ±50 ppm/°C. Isolation: 1500 V AC between channels and backplane; channel‑to‑channel non‑isolated. Power consumption: 200 mA at 5 V DC from backplane, plus 80 mA at 24 V DC (external supply for loops). LED indicators: per‑channel status (active, fault), module power and communication. Dimensions: 140 mm × 25 mm × 110 mm. Weight: 0.3 kg. Operating temperature: 0°C to 60°C. Storage: -40°C to 85°C. Humidity: 5-95% non‑condensing. Protection: IP20.

Key Features

• 8 analog output channels, 0‑20 mA or 4‑20 mA software selectable

• 16‑bit resolution for precise current control

• Fast conversion time: 5 µs per channel

• Channel‑to‑backplane isolation (1500 V AC)

• On‑board diagnostics: open loop detection, short circuit protection

• LED indicators per channel for active and fault status

• Removable terminal block for easy wiring

• Compatible with Rx3i CPUs (IC695CPExxx, IC695CPUxxx)

• Configurable with Proficy Machine Edition

Configuration and Programming

The IC695ALG708-AB is configured in Proficy Machine Edition’s hardware configuration. Each channel can be independently set to 0‑20 mA or 4‑20 mA. The module automatically scales the 16‑bit raw output value (0‑65535 for 0‑20 mA; 8192‑65535 for 4‑20 mA) to the corresponding current. Fail‑safe behavior is programmable: on loss of communication or CPU stop, outputs can hold last value, go to user‑defined safe value, or go to minimum/maximum. The module also supports output ramping to avoid sudden changes. Calibration data is stored in non‑volatile memory.

Applications

The IC695ALG708-AB is used in process control loops (e.g., controlling I/P converters for pneumatic valves), speed reference for variable frequency drives (VFDs), setpoint control for chart recorders and controllers, and analog signal simulation for testing. Typical industries include chemical, pharmaceutical, oil & gas, water treatment, and general factory automation.

Installation and Wiring

Install the module into any I/O slot of an Rx3i Universal Backplane (IC695CHSxxx). The module is hot‑swappable, but care should be taken to match firmware versions. Connect an external 24 V DC power supply to the terminals marked “+24V” and “0V” for the current loops. For each output channel, connect the current loop positive (+) to the device (e.g., valve positioner) and return to the module’s “RTN” terminal (internal current sink). Use shielded twisted‑pair cable and ground the shield at one end. The terminal block is removable for pre‑wiring. After installation, configure the module in Proficy Machine Edition and download the hardware configuration.

Diagnostics and Maintenance

Each output channel has a green LED (active when output is enabled) and a red LED (fault). Common faults include open loop (wire break) or short circuit. The module reports diagnostic information via the backplane to the CPU, which can be read in the user program or via the programming software. The module requires no routine calibration or maintenance. Periodically inspect terminal connections and keep the module free from dust.

Environmental and Compliance

The IC695ALG708-AB is CE, UL, and RoHS compliant. Operating temperature: 0°C to 60°C. Storage: -40°C to 85°C. Humidity: 5‑95% non‑condensing. Vibration: 2g (10‑55 Hz). The module must be installed in a pollution degree 2 environment (control cabinet).

Conclusion

The GE Fanuc IC695ALG708-AB analog output module provides reliable, high‑precision current outputs for PACSystems Rx3i. Its 8 channels, 16‑bit resolution, and fast conversion time make it suitable for demanding process and factory automation applications requiring accurate analog control.