Honeywell FC-RUSIO-3224 (Remote Universal Safety I/O Module)
The remote safety I/O module of Honeywell SafetyNet FSC/Safety Manager system, 32DI+24DO, SIL3 level, is used for remote interlocking and emergency shutdown (ESD) in high-risk scenarios such as chemical/oil and gas/electricity.

1、 Model and Identity
Model: FC-RUSIO-3224
Brand: Honeywell
Series: SafetyNet FSC/Safety Manager (SM)
Full name: Remote Universal Safety I/O Module
Type: Distributed Security I/O (SIS/ESD specific)
Core certification: T Ü V SIL3, PL e (highest safety level)
2、 Core functions
High density safety I/O: 32 digital inputs DI+24 digital outputs DO, full channel electrical isolation+fault diagnosis.
Remote distributed architecture: Connect FSC/SM controllers remotely via SafetyNet fieldbus, up to several kilometers away, reducing long-distance hard wiring.
Fail Safe: In the event of communication/power/hardware failure, the output automatically sets to a safe state (such as cutting off valves or shutting down).
Redundancy and high availability: dual power supply, dual communication, channel level redundancy, switching time * *<50ms * *, supports hot plugging.
System Integration: Seamless integration with Expert PKS DCS and Safety Manager SIS to achieve DCS+SIS integrated control.
3、 Hardware specifications
1. I/O channel
DI: 32 channels, 24VDC, dry/wet contacts, optoelectronic isolation, supporting source/drain type.
DO: 24 channels, relay/transistor, 24VDC/220VAC, short circuit/overcurrent protection.
2. Communication and Electrical
Bus interface: SafetyNet (dedicated safety bus), redundant dual network.
Serial port: RS-232/RS-485, supports Modbus RTU, connects to third-party instruments.
Power supply: 24VDC ± 10%, dual redundant input, anti reverse/overvoltage.
Isolation: 1500Vrms, fully isolated channel ground and channel channel.
3. Environment and Physics
Temperature: 0 ℃~+55 ℃ (industrial standard).
Protection: IP20, 3U rack installation, fixed with rails/backboards.
Size/Weight: Approximately 120 × 200 × 80mm, 1.8kg.
4、 Typical application scenarios
Petrochemical industry: reactor/tower ESD emergency shutdown, interlock protection, safety valve control.
Oil and gas extraction: wellhead pressure/temperature interlock, pipeline shut-off valve control, flare system.
Electric energy: boiler/turbine trip, fuel cut-off, MFT main fuel trip.
Pharmaceutical/Fine Chemicals: High risk reaction process safety interlock, sterile environment monitoring.
5、 Difference in positioning of models
FC-RUSIO-3224 (Honeywell): SIL3 remote safety I/O, 32DI+24DO, SIS/ESD dedicated, high-risk scenario interlocking.
IS220PAOCH1A (GE): Mark VIe analog output, 8-channel AO, turbine/generator valve drive.
TIOC-555HD (CCC): Compressor specific I/O+control, anti surge/speed control.
PCD235A/UFC921A (ABB): excitation/transmission main control+communication, generator AVR control.