I. Basic Information

Model: F3224A (Upgrade version of F3224 / Compatible alternative version)

Series: HIMA F3 (19" Rack-mounted SIS, compatible with F3112/F3114 CPU)

Function: 16 channels of safety digital input (DI)

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

Programming Software: ELOP II

Status: Out of Production (EOL), No new stock from the original manufacturer, available in second-hand / inventory / refurbished form

II. Electrical Specifications (Similar to F3224)

Channels: 16 DI, each channel with independent diagnosis

Input signals: 24 VDC dry contacts / 8 mA NAMUR sensors

Isolation: 2.5 kVrms high isolation

Response time: Typical 8 ms

Power supply: Backplane 5 VDC (80 mA) or external 24 VDC (150 mA)

Diagnosis: Open circuit / short circuit / line resistance detection, channel-level fault isolation

Environment: 0 ℃ to +60 ℃, IP20

Size / Weight: 19" rack, 4TE wide; approximately 0.12 kg

III. Differences between F3224A and F3224 (Core Compatibility)

Hardware: Minor PCB revision, optimized for interference resistance and long-term stability, fully compatible pins/rack, can be directly interchanged

Firmware: Diagnosis algorithm fine-tuning, more sensitive fault detection, does not affect logic and wiring

Identification: Model changed from F3224 to F3224A, functional parameters remain the same

Positioning: F3224A is the direct replacement / compatible upgrade model of F3224

IV. Comparison of DI Modules in the Same Series

F3221/F322116: 16DI, 2 kV isolation, 10 ms, basic diagnosis

F3222: 16DI, 2 kV isolation, 10 ms, enhanced diagnosis

F3223: 32DI (2×16), 2 kV isolation, 10 ms, dual group diagnosis

F3224/F3224A: 16DI, 2.5 kV high isolation, 8 ms fast response, the most comprehensive diagnosis

V. Replacement Suggestions

Direct replacement: F3224 (fully compatible, interchangeable), F3222 (same 16DI, enhanced diagnosis)

High isolation replacement: No fully equivalent isolation model available, use F322116 + external isolation barrier

System upgrade: HIMatrix F35 or HIMax (SILworX, Modern Communication, full series I/O)