I. Model Positioning (Easy Differentiation within the Same Series)

Z7116: 16DI (24VDC Input)

Z7126: 16AI (4-20mA Input)

Z7127: 16AO (4-20mA Output)

Z7136: 16DO (Relay Type, 250VAC/2A)

Z7138: 8DO (Transistor Type, 24VDC/2A) ✅

Series: H41q/H51q (Old System); X-Series (HIMax) Not Available

II. Basic Information

Brand: HIMA

Model: Z7138

Type: 8-channel safety-level digital output DO (transistor / 24VDC)

Safety Level: SIL3 (IEC 61508), TÜV AK6, PL e

Output Type: 24VDC transistor output (source type / sinking option available)

Load: 24VDC DC load (valve, contactor, alarm light)

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

Status: Older model original, replaceable spare parts available 

III. Core Technical Parameters (Official)

Channels: 8 DO channels, isolated independently

Output Voltage: 24VDC (±10%)

Current per channel: ≤2A (resistive), ≤1A (inductive)

Maximum load: 48W per channel (24V x 2A)

Short circuit / overload protection: electronic self-recovery, SIL3 diagnosis

Isolation: 500V AC isolation between channels

Diagnosis: Output short circuit / open circuit / overload / power supply failure, diagnostic coverage ≥ 99.9%

Power supply: 5VDC (backplane) + 24VDC (field load)

Power consumption: ≈8W

Operating temperature: -20℃ to +70℃

Size: Standard 8TE (same as Z7116/Z7126/Z7127/Z7136)

Weight: ≈0.5kg

IV. Derivative Model Rules (Same Series Standards)

Z7138/3330: Bare module (without cables)

Z7138/3330/C5: C5 anti-corrosion coating (for marine / chemical corrosion environments)

Z7138/3331: With 5-meter prefabricated shielded cable + connector

V. Z7138 vs Z7136 (Selection Key) Table

Comparison item  Z7138 (8DO Transistor)  Z7136 (16DO Relay)

Number of channels  8  channels

Output type  24VDC Transistor (DC)  Relay contacts (AC/DC compatible)

Voltage range  Only 24VDC  24VDC - 250VAC

Single-channel current  2A (24VDC)  2A (resistive) / 1A (inductive)

Life  Semi-permanent (no mechanical contacts)  Approximately 100,000 times (full load)

Applicable loads  24VDC Electromagnetic Valves, Warning Lights  AC/DC Electromagnetic Valves, Contactors, Motors

Price  Slightly higher  Slightly lower

Six. Typical Applications (SIS/ESD/F&G Systems)

24VDC Electromagnetic Valve Drive: Emergency Shut-off Valve, Blow-off Valve, Fire Valve

Safety Relay / Contactor: Pump / Fan / Compressor Safety Shutdown

Alarm Output: 24VDC Sound and Light Alarm, Warning Light

Interlock Contacts: DCS/PLC 24VDC Interlock Signal

Seven. Compatibility (Must Read)

✅ Compatible: H41q / H51q / HIQuad X Older Systems

❌ Incompatible: HIMax X Series (X-CPU01/X-SB01), Completely Incompatible