HIMA F3225 is a 16-channel SIL3 safety DI module for the H41q/H51q system. It belongs to the older H series and has similar functions to F3224 but different electrical/ diagnostic specifications. It has been discontinued and is only available as spare parts.

1. Basic Information

Model: F3225 (not F3 series, belongs to the H41q/H51q platform)

Brand/Series: HIMA (Black Horse) / H41q/H51q Safety Control System

Function: 16-channel safety digital input (DI), SIL3 certified

Safety Level: SIL3 (IEC 61508), TÜV certification, Cat.4/PL e

Programming Software: Special H41q/H51q configuration tool (not ELOP II)

Status: Discontinued (EOL), no new stock from the original factory, available in second-hand / inventory / refurbished supply.

II. Electrical Specifications (Key Differences from F3224)

Channels: 16 DI, no channel-level independent diagnostics (only group diagnostics)

Input signals: 24 VDC dry contacts, does not support NAMUR sensors

Isolation: 2 kVrms isolation (lower than 2.5 kV of F3224)

Response time: Typical 10 ms (slower than F3224)

Power supply: Backplane 5 VDC (100 mA), no external 24 VDC power supply

Diagnosis: Only group-level open/closed circuit detection, no single-channel fault isolation

Environment: 0 ℃ to +60 ℃, IP20

Size/Weight: 19" rack, 4TE wide; approximately 0.113 kg

III. Core Differences from F3224/F3224A (Cannot be Directly Interchanged)

Platform: F3225 for H41q/H51q; F3224 for F3 series (rack/backplane incompatibility)

Diagnosis: F3225 group diagnosis; F3224 single-channel independent diagnosis

Input: F3225 only dry contacts; F3224 dry contacts + NAMUR

Isolation: F3225 2 kV; F3224 2.5 kV high isolation

Response: F3225 10 ms; F3224 8 ms fast response

Software: F3225 uses H41q tools; F3224 uses ELOP II

IV. Alternative Suggestions

Platform substitution (H41q/H51q): No fully equivalent model available, use F3226 (16DI, enhanced diagnostics, same platform)

Cross-platform upgrade (F3 series): Replace the rack with F3112/F3114, select F3224A (16DI, high isolation, full diagnostics)

System upgrade: Migrate to HIMax (SILworX) or HIMatrix F35, compatible with modern I/O and communication