HIMA Z7126 (H41q/H51q legacy system 16-channel analog input AI module, 4-20mA, SIL3)

Z7126 is a 16-channel analog input (AI) module for HIMA H41q/H51q (HIQuad X) legacy platform, specifically for collecting 4-20mA field transducer signals (pressure, temperature, flow, level), SIL3, 15-bit accuracy, channel isolation, and is part of the legacy system I/O like Z7116 (DI), but not compatible with the X-series (HIMax). 

1. Model Identification (Quick Differentiation)

Z7116: 16-channel Digital Input DI (Switching Quantity, 24VDC)

Z7126: 16-channel Analog Input AI (4-20mA, Transmitter)

Z7127: Analog Output AO

Z7136/Z7138: Other DI/AI

Series: H41q / H51q / HIQuad X (legacy system), and completely incompatible with X-CPU01 / X-SB01

II. Basic Information

Brand: HIMA

Model: Z7126

Type: 16-channel analog input AI module (4-20mA)

Safety Level: SIL3 (IEC 61508), TÜV AK6

Signal: 4-20mA (active / passive, configurable)

Resolution: 15 bits

Accuracy: ±0.1% of reading (typical)

Adapter Backplane: H41q/H51q chassis (not X-BASE)

Status: Older model, original imported, spare parts replacement available

III. Technical Specifications (Official)

Channels: 16 AI, 2 groups × 8 channels, group isolation + channel-to-channel isolation

Signal Range: 4-20mA (measurable from 0-22mA)

Load Capacity: ≤ 750Ω per channel

Isolation: 500V AC channel-to-channel isolation, safety-level isolation

Common Mode Suppression: >120dB @ 50/60Hz

Power Supply: 5VDC (backplane power supply)

Power Consumption: ≈5W

Diagnosis: Open circuit / short circuit / overrange / power failure, SIL3 diagnostic coverage ≥99.9%

Operating Temperature: 0℃ ~ +60℃

Size: 25×125×100mm (8TE, H41q standard slot)

Weight: ≈0.4kg

IV. Core Functions

16-channel SIL3 analog signal acquisition

Receive 4-20mA signals from pressure / temperature / flow / level transmitters

High-precision conversion (15 bits), for ESD/F&G system calculation

Channel-level safety diagnosis

Real-time detection of open circuit, short circuit, overrange, power failure

Single-channel failure does not affect other channels, safety failure → system safety action

Isolation anti-interference

500V AC isolation between channels, suppressing ground loops and electromagnetic interference

Suitable for high-noise / corrosive environments such as chemical plants, offshore platforms

V. Common Derivative Models (Same as Z7116 Logic)

Z7126/3221: Bare module (without cable)

Z7126/3236: With 5-meter prefabricated cable + connector

Z7126/3221/C5: C5 three-proof coating (damp-proof / mold-proof / salt spray-proof, for use in offshore / high-corrosive environments)