HIMA F7126 Galvanically Isolated Input Module – Supports Fail-Safe Wiring in Oil, Gas & Chemical Plants
Description
The HIMA F7126 is a 32-channel digital input(DI)module engineered for HIMA’s HIMax®safety PLC platform—a leading SIL 3-certified system used in high-integrity safety applications worldwide.Designed for integration into HIMax H41q,H51q,and H61q controller racks,the F7126 provides reliable acquisition of binary field signals such as limit switches,pushbuttons,valve feedbacks,motor starters,and fire/gas detector contacts.
Each input supports 24VDC sourced or dry-contact wiring,with galvanic isolation between field circuits and the internal logic bus,ensuring immunity to ground loops,surges,and electrical noise.The module features integrated wire-break detection(open-circuit monitoring)and short-circuit protection,critical for maintaining diagnostic coverage in safety instrumented functions(SIFs).
Certified to IEC 61508:2010(SIL 3)and IEC 61511,the F7126 is suitable for use in Emergency Shutdown(ESD),Burner Management Systems(BMS),High-Integrity Pressure Protection Systems(HIPPS),and machinery safety applications.It supports hot-swap replacement in redundant HIMax configurations,enabling maintenance without process interruption—a key requirement in continuous-operation industries.
Application Scenarios
At a North Sea offshore platform,a HIPPS system using HIMA HIMax H51q controllers relies on F7126 modules to monitor 256 pipeline pressure switch statuses.During a routine inspection,a corroded terminal caused an open circuit on one input.The F7126’s wire-break detection immediately triggered a diagnostic alarm(not a spurious trip),allowing technicians to repair the wiring during the next planned window—preventing an unnecessary$5M production shutdown while maintaining full safety integrity.
Parameter
Main Parameters Value/Description
Product Model F7126
Manufacturer HIMA Paul Hildebrandt GmbH+Co KG
Product Category Digital Input(DI)Module for HIMax Safety PLC
Compatible Controllers HIMax H41q,H51q,H61q(all firmware versions with I/O compatibility)
Number of Channels 32 independent digital inputs
Input Type
•24 VDC sourced input(current-sinking)
•Dry contact/passive switch(with external 24VDC supply)
Nominal Input Voltage 24 VDC±10%(19.2–28.8 VDC)
Input Current~3 mA per channel(at 24 VDC)
Input Filtering Adjustable debounce(software-configurable:0–50 ms)
Wire-Break Detection Yes–detects open circuits on passive/dry-contact wiring
Short-Circuit Protection Yes–per channel,auto-recovery
Galvanic Isolation Field-to-system:500 VAC RMS;Group isolation(per 8 channels)
Diagnostic Coverage>99%(per IEC 61508 FMEDA)
Hot-Swap Support Yes–in redundant HIMax racks with proper baseplate
LED Indicators
•Green RUN:Module operational
•Yellow DIAG:Diagnostic active(e.g.,wire break)
•Red ERR:Internal fault or communication loss
Power Consumption~3.8 W(from backplane)
Operating Temperature 0°C to+60°C
Dimensions Standard HIMax module:~240 mm(H)×35 mm(W)×180 mm(D)
Weight~0.85 kg
Certifications
•SIL 3 per IEC 61508:2010
•IEC 61511
•ATEX(II 3G Ex nA IIC T4 Gc)
•IECEx
•UL 61010-1,CE,RoHS
Mounting Slide-in module for HIMax carrier—secured with front screw
Technical Principles and Innovative Values
Innovation Point 1:High Channel Density with Safety Integrity–32 channels in a single slot reduce cabinet space and cost while maintaining SIL 3 compliance.
Innovation Point 2:Advanced Diagnostics–Wire-break detection ensures dangerous undetected faults are minimized,boosting safe failure fraction(SFF).
Innovation Point 3:Flexible Wiring Topology–Supports both active(sourced)and passive(dry contact)sensors—ideal for mixed legacy/new installations.
Innovation Point 4:Seamless Integration with HIMA Engineering Studio(ES)–Channel configuration,filtering,and diagnostics managed centrally.
Application Cases and Industry Value
In a German chemical plant,F7126 modules interface with over 500 emergency stop buttons and door interlocks on reactor skids.The consistent 24VDC input behavior and fast response(<10 ms)ensure machine safety systems meet ISO 13849 PL e requirements.
Similarly,a U.S.LNG export terminal uses F7126 in its flare ignition monitoring system.Despite high EMI from nearby compressors,the galvanic isolation prevents false signals—ensuring reliable flame-on confirmation.
Related Product Combination Solutions
HIMax Controllers:H41q,H51q,H61q–main safety CPUs
Digital Output Modules:e.g.,F7136(32-channel DO)–for solenoid/relay control
Analog I/O Modules:e.g.,F7216(AI),F7226(AO)–for pressure/temperature SIFs
HIMA Engineering Studio(ES):Configuration,logic programming,and diagnostics
HIMA SafeLink:For secure remote access and asset monitoring
Redundant Power Supplies:e.g.,F7011/F7012–ensure continuous I/O operation
Terminal Blocks:e.g.,F79xx series–removable for pre-wiring
Safety Networks:PROFIsafe,Modbus/TCP(via communication modules)
Installation,Maintenance,and Full-Cycle Support
Installation of the HIMA F7126:
Insert into designated I/O slot in HIMax rack
Secure with front-panel captive screw
Connect field wiring to compatible terminal block(e.g.,F7926)
Configure input type and filtering in HIMA Engineering Studio
Download configuration—module auto-initializes
Maintenance advantages:
Per-channel diagnostics visible in HIMA ES
Hot-swap in redundant systems eliminates downtime
LED status allows quick visual troubleshooting
We supply HIMA F7126 modules that are:
Factory-new(direct from HIMA)or professionally refurbished/tested
Fully validated on live HIMax test benches with simulated field signals
Verified for hardware revision and firmware compatibility
Packaged with ESD-safe materials and accompanied by test&certification reports
With deep expertise in functional safety systems and global access to HIMA components,we ensure your Safety Instrumented System(SIS)remains certified,compliant,and always ready to protect people,assets,and the environment.
Contact us for a customized solution—whether you’re commissioning a new SIS,replacing aging I/O,or building a strategic spare inventory for your HIMax infrastructure.
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