Year: 2026

Extensions, Upgrades, and Modernization

Systems, technology, and standards change continuously. To ensure the long-term safety and

availability of your plants, our experts will assist you to keep them up to date during operation.

As part of our modernization services, our experts support you with on-site analysis and advise

you on all options and technologies to keep your plant up to date. This includes consulting on

system upgrades, maintaining your equipment, and updating to compatible successor models.

Our modernization services include upgrade planning, logic conversion from ELOP II to SILworX,

and installing your systems in accordance with the latest safety standards.

Modernizations to HIQuad X will have additional benefits:

• Seamless modernization

HIQuad I/Os including field wirings can be kept as they are, which reduces costs as

compared to new installations. Software engineering is supported through automatic

logic conversion, reducing engineering effort and potential sources of errors.

• Reduced downtime

Unchanged parts can be tested more easily, reducing the downtime required for modernization.

• Modernization flexibility

You have complete freedom to perform modernization in a single step or in multiple phases.

• Improved safety and security

HIQuad X provides you the optimal basis to bring your system to the latest standard of

functional safety according to IEC 61511 and automation security according to IEC 62443.

• Better performance

State-of-the-art technology offers improved features, such as: reduced cycle time,

improved reload capabilities, increased system availability, less engineering effort, and

improved maintenance.

• Continued support:

Products that enter the legacy phase will have limited availability and will not receive updates

or new features. HIQuad X fully supports new safety features and future certifications.

HIMA products give you maximum, long-term plant availability. To ensure this, we continually

modernize our product portfolio with new technologies. Compatible successor products ensure

your safety system continues to operate smoothly many years after installation. This reduces life

cycle costs, avoids unplanned downtime, and ensures investment protection for your assets.

HIQuad H41q/H51q was introduced to the market in 1997 as the third generation of central modules

for certified programmable safety systems. In 2018. the fourth generation of central modules was

introduced to ensure the sustainability of the HIQuad system family. The new central modules support

a wide variety of I/O modules from the previous generation. The combination of the reliable HIQuad I/O

modules and the new central modules is named HIQuad X. This guarantees maximum compatibility

for field installations and minimum modernization efforts.

Signal Exchange and Communication

Conventional signal boxes are connected to a marshalling cabinet, which in turn establishes the 

connection to the remotely installed safety controller.

The HIJunctionBox is connected directly to the safety controller.

Smart Safety Platform

The HIJunctionBox is part of the Smart Safety Platform, the world’s first safety platform

that supports compact, non-redundant, and redundant applications. Customers can

combine individual components as they wish and, therefore, implement their own custom

safety strategy – flexibly and cost effectively. The other components of the Smart

Safety Platform are the HIMax, HIMatrix, and HIQuad X controllers, the SILworX

engineering tool, and the SafeEthernet protocol.

The HIJunctionBox comes pre-configured and tested. The various assembly options for

inputs and outputs deliver a high level of flexibility. Communication with the SIS occurs via

fiber-optic cables. The HIJunctionBox can therefore be quickly and simply integrated into

existing systems. The requirements of your plant determine whether you use HIMax or

HIMatrix components.

Key Benefits

• Reduced hardware costs:

Marshalling cabinets and a significant amount of cables from the field to the SIS are not required.

• Reduced infrastructure  costs: The spatial require- ments in the control center are minimized,

requiring fewer cable routes and less marshalling.

• Shorter FAT: Thanks to standardization and testing, the factory acceptance test is completed more

quickly.

• Simplified engineering:

The cabling effort is lower, changes to inputs and outputs can be implemented without rewiring.

• Quicker testing and troubleshooting: Testing during the operational phase is comparatively

short due to its low complexity.

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

Communication Features of HIQuad X

A new communication module F-COM 01 comes included with HIQuad X. It supports the consistent

HIMA security concept. With HIQuad X, you have new opportunities as well as well-known existing

communication paths. Additionally, HIQuad X increases the availability of the communication to

redundant third-party systems.

You can connect HIQuad X systems to each other via the HIMA safety protocol SafeEthernet. Also,

HIMax, HIMatrix systems and RIOs can be combined safely. To establish a safety-related connection to

existing HIQuad installations, the protocol HIPRO-S V2 is implemented in HIQuad X.

• 2 Ethernet interfaces on F-CPU 01 and F-COM 01.

• Interference-free, peer-to-peer connections between each F-CPU 01 and each of the up to

• 10x F-COM 01 modules.

• The whole IP address range can be used.

• Enhanced communication options such as subnet masks and virtual LAN to segregate nets can

be programmed.

• One serial interface per F-COM 01.

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

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.

HIMatrix is a range of versatile, commercial off-the-shelf (COTS) controllers for small to mid-scale

safety-criticalapplicationsintherail industry.Thestandardsystemispre-certifiedinaccordance

with CENELEC SIL 4 and can be used in any system integrator solution. Designed to be compact,

vibration and shock resistant, and having an extended operating temperature range, HIMatrix is

ideal for demanding environments, such as passenger trains. HIMatrix is easy to install and can be

used in networked and time-critical applications.

Characteristics

• CENELEC SIL 4

• Fast,flexible,compact

• Extremely cost-effective

• Distributed applications

• Applications with just a few I/O points

Engineering Tools

HIMatrix systems can be engineered using SILworX.

• Function block diagrams (FBD)

• Sequential function charts (SFC)

• Structured text (ST)

• C code (optional)

List of Certificates

• EN 50126:1999 (SIL 4)

• EN 50128:2011 (SIL 4)

• EN 50129:2003 (SIL 4)

• EN 50159:2010

• EN 50155:2007

• EN 50125-3:2003