TheAO895(3BSC690086R1) is a high-performance 8-channel analog output module featuring built-in Intrinsic Safety (IS) for hazardous area operations. Engineered for the S800 I/O system, it provides 4–20 mA signals directly to field equipment in explosive atmospheres without requiring external safety barriers. This module is optimized for driving Ex-certified actuators and current-to-pressure (I/P) converters while maintaining full HART communication transparency for advanced instrument diagnostics and configuration.
Technical Specifications
Model Number:AO895(3BSC690087R1)
Output Type:Analog Output (Unipolar Single-Ended)
Number of Channels:8
Signal Specification:4 to 20 mA
HART Support:Yes, integrated on each individual channel
Safety Rating:Intrinsically Safe (Ex) for hazardous areas
Loop Current:Up to 20 mA per channel (Limited to 22 mA in overload)
Isolation:1 group of 8 channels isolated from ModuleBus and ground
Power Source:Converted from the 24 V power supply connections
Mechanical Platform:S800 I/O System
Compatible MTU:TU890 (Compact MTU for Ex applications)
Key Engineering Features
TheAO895(3BSC690087R1) is designed to simplify the control of field instrumentation in volatile environments through several specialized engineering characteristics:
Barrier-Free Integration:By incorporating intrinsic safety components directly into the module, engineers can significantly reduce DIN-rail space and cabinet wiring complexity.
HART Data Pass-Through:Enables seamless bi-directional communication with smart field devices, allowing for remote calibration, status monitoring, and asset management via the DCS.
Robust Load Management:Each channel is specifically designed to drive Ex-certified I/P actuators, providing stable current delivery even under varying load conditions.
Advanced Circuit Protection:The output stages are group-isolated and feature internal current limiting at 22 mA to prevent hardware damage during field faults or overload scenarios.
