HIQuad X is a programmable electronic safety system made by HIMA. The flexible and scalable
system family is a further development of HIQuad, which has been in use within various applications
in the process industries for over 30 years.
The modernization combines tried-and-tested HIQuad I/O technology with the high-availability and
high-performance HIMax system technology. HIQuad X is programmable with SILworX, the HIMA
engineering tool. HIQuad X safety systems are installed if restrictive safety requirements must be
fulfilled – without any compromises on system availability. The safety PLC can be used on a centralized
as well as decentralized basis. A huge variety of I/O modules can be used – including intrinsically
safe SIL 3 modules.

Typical Applications
• Safety functions for
• de-energize to trip
• energize to trip
• Continuous and batch plants
• Burner and boiler protection
• Oil and gas pipelines
• Ships and offshore platforms
• etc.
HIQuad X System Benefits
• One common engineering platform
• Higher performance
• Enhanced reload functions
• Comprehensive communication options
• Safe communication between HIMA systems
• Implementation of the proven HIMA security concept
Modernization Benefits
• Shorter turnaround times for modernization
• Less modernization effort compared to new installation
• No changes of I/O modules including field wiring
Technical Highlights
• Two systems: H51X and H41X
• Common usage of the same modules for H51X and H41X
• Supports 24 existing HIQuad I/O modules
• Per H51X system up to 16 I/O extension racks with up to 256 I/O modules
• Per H41X system with up to one I/O extension rack with up to 28 I/O modules
• Flexible I/O architecture mono and redundant loops can be mixed, which reduces footprint
• Reload of application, hardware and communication
• Reduced cycle times
• Faster REAL calculation
• Freedom of interference between F-CPU 01 and I/O modules
• Cross connection between modules increases system availability
• Multitasking with up to 32 application programs
• Improved diagnosis for faster maintenance and troubleshooting
• Improved haptics
• Extended system bus
• Better EMC stability
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