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HIMA F8650｜CPU Module｜
This module is a central safety processing unit for HIMA rack-based Safety Instrumented Systems (SIS) and Emergency Shutdown Systems (ESD).
It acts as the system core, executing safety logic, coordinating I/O and communication modules, and ensuring fault-safe operation in high-risk industrial environments.
Key Specifications
Processor Architecture
Dual Intel 386EX 32-bit processors
Lockstep synchronous operation
Clock frequency: 25 MHz
Continuous cross-checking for fault detection
Memory Configuration
System Flash: 1 MB
User Program Flash: 1 MB
Data SRAM: 1 MB
Communication Interfaces
2 × electrically isolated RS-485
Supports:
Modbus RTU / ASCII
PROFIBUS DP supported via dedicated communication modules
Diagnostics & Safety Outputs
Four-digit matrix display
LED status indicators
Safety watchdog output:
24 V DC, up to 500 mA
Short-circuit protected
Power Supply & Installation
Power supply: 5 V DC / 2 A (backplane-fed)
Installation: 19-inch rack, 8 SU width
Environmental Conditions
Operating temperature: −20 °C to +60 °C
Redundancy & Availability
Supports dual-machine hot standby
Ensures high availability and fault-safe system behavior
Core Functionality
Fault-Safe Operation
Lockstep dual CPUs continuously cross-check execution results. Any detected discrepancy leads to a defined safe state, ensuring compliance with functional safety requirements.
Central System Coordination
Acts as the system hub, coordinating:
Safety I/O modules (e.g. F6217, F6706)
Communication modules (e.g. F8627X, F8628X)
Execution of safety logic and interlocks
Comprehensive Diagnostics
Real-time monitoring of:
Supply voltage
Temperature
Communication status
Memory integrity
Enables rapid fault localization and reduced downtime.
Configuration & Maintenance
Engineered and maintained via ELOP II
Supports online diagnostics
Hot-plug capable modules allow maintenance without system shutdown
Typical Applications
Used in safety-critical industrial systems, including:
Petrochemical and chemical processing
Offshore oil and gas installations
Power generation
Metallurgy and heavy industry
Common safety functions include:
Process emergency shutdown (ESD)
Unit and equipment protection
Safety interlocking
HIMA F8650｜CPU Module｜
By structuring the information in this manner, the article provides a clear and organized understanding of input channels, transducer supply, and communication implementations in distributed control systems.
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