HIMA F3237 (material number 984323702) is a 8-channel SIL3 safety DI module of the HIMatrix series, supporting NAMUR sensors. The complementary model of F3226A/F3236 in the same series is available in production.

I. Basic Information

Model: F3237 (984323702)

Brand/series: HIMA (Black Horse) / HIMatrix (F3 series, distinct from HIQuad H41q/H51q)

Function: 8-channel secure digital input DI, SIL3 certification (IEC 61508), TÜV AK6, Cat.4/PL e

Applicable platform: HIMatrix F3 series chassis (such as F3112/F3114), incompatible with H41q/H51q

Status: In production, new goods can be ordered, sufficient compatible spare parts are available

II. Electrical Specifications (NAMUR Special Type)

Channels: 8 channels of DI, each channel with independent diagnosis

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

Signal thresholds:

0 signal: 0.35–1.2 mA

1 signal: 2.1–6.0 mA

Open circuit: ≤0.28 mA

Short circuit: ≥6.5 mA

Line resistance / line length: ≤50Ω (DIN 19234); ≤1000m (0.5mm² wire diameter)

Isolation: 2 kVrms

Response time: Typical 10 ms

Power supply: Backplane 5 VDC (90 mA) + 24 VDC (170 mA) dual power supply

Diagnosis: Single-channel open circuit / short circuit / line resistance detection, fault coverage >99%, automatic storage of 500 diagnostic logs

Environment: -20 ℃ to +60 ℃, IP20

Size / weight: 19" rack, 4TE wide; approximately 0.15 kg

III. Differences from F3226A/F3236 Core

F3237 vs F3226A (same platform F3 series)

Channels: F3237 8 channels; F3226A 16 channels

Inputs: Both 8mA NAMUR + dry contacts

Diagnosis: F3237 has stronger log storage, suitable for long-distance sensors

F3237 vs F3236 (incompatible across platforms)

Platform: F3237 F3 series (in production); F3236 H41q/H51q (retired)

Channels: F3237 8 channels; F3236 16 channels

Current: F3237 8mA; F3236 6mA

IV. Replacement and Selection Suggestions

F3 Series 8-channel DI: Select F3237 (in production)

F3 Series 16-channel DI: Select F3226A (in production)

H41q/H51q Upgrade: Abandon F3236, replace with F3 rack + F3226A, or migrate to HIMax