1. Product Overview

HIMA HIMax X-DI6401 is a high-density safety digital input module tailored for HIMA HIMax safety PES. It features 64 fail-safe DI
channels to collect field discrete sensor signals and transmit verified safety data to HIMax CPUs. TÜV SIL3 certified, it complies with
IEC 61508, IEC 61511 and EN ISO 13849-1. Adopting 24VDC sinking input design with full channel self-diagnosis, it switches to safe 

zero state automatically upon wiring or hardware faults to avoid hazards. Widely used in petrochemical, power, oil & gas and machinery
safety interlock systems, it acts as standard replacement I/O card for HIMax rack cabinets.

2. Full Technical Specifications

• Brand: HIMA Paul Hildebrandt (Germany safety automation)
• Model: HIMax X-DI6401
• Type: SIL3 safety digital input I/O module for HIMax safety PLC
• Safety Rating: TÜV SIL3, PL e, Cat.4
• Channels: 64 unipolar digital inputs
• Input Logic: Sinking, Type3 (IEC 61131-2)
• Rated Voltage: 24VDC SELV/PELV (-15% ~ +20% tolerance)
• Single Channel Current: 2.3~2.9mA
• Module Power: 400mA Min ~ 1.5A Max
• Withstand Voltage: -3V ~ 30V DC
• Isolation: No galvanic isolation between channels
• Diagnosis: Open circuit, short circuit & undervoltage detection
• Fail-Safe Behavior: Fault channels output fixed 0 safety signal
• Filter: Adjustable ON/OFF delay for anti-interference
• Working Temp: 0°C ~ +60°C; Storage Temp: -40°C ~ +85°C
• Humidity: 5%~95% RH, non-condensing; Protection: IP20 (cabinet use only)
• Size: 38×133×120mm; Net Weight:1.1kg; Shipping GW:2.0kg
• Mounting: Hot-pluggable HIMax baseplate slot
• Indicators: Front LEDs for bus, fault and power status
• Compatibility: All HIMax CPUs (X-CPU01, X-CPU31)
• Certifications: CE, UL, IEC 61000 EMC

3. Core Advantages

1. Ultra-high density 64-channel design cuts cabinet space and system cost.
2. SIL3 certification satisfies strict safety interlock demands for process critical loops.
3. Real-time full-channel diagnosis rapidly locates wiring and hardware faults to reduce downtime.
4. Hot-swappable design enables live replacement without rack power-off, lowering production loss.
5. Tunable signal filter suppresses industrial EMI and false sensor triggers.
6. Dedicated HIMax backplane bus delivers stable high-speed communication with CPU.
7. Reinforced PCB & wide-temperature hardware support stable operation in harsh industrial sites.
8. All units pass full communication, diagnosis and safety aging tests before shipment.

4. Main Application Scenarios

• Petrochemical Safety Interlock: Collect valve, pressure switch and E-stop signals for process protection
• Thermal Power DCS Safety Rack: Monitor boiler & turbine auxiliary safety sensors
• Oil & Gas Pipeline System: Safety DI for compressor station and pipeline leak interlock logic
• Heavy Machinery Protection: Signal acquisition for presses, cranes and metallurgical mills
• Chemical Batch Control: Multi-channel safety monitoring for reactors and storage tanks
• New Energy Power Plant: Matches safety PLC cabinets of wind and solar farms

5. Our Supply Advantages

1. In-stock new original & fully-tested refurbished X-DI6401, global air delivery within 4–6 days.
2. 12-month full warranty after complete functional testing for every module.
3. Free access to original datasheet, wiring manual, SILworX guide and troubleshooting docs.
4. Global door-to-door shipping via DHL/FedEx, covering over 130 countries.
5. Favorable unit price for bulk orders of HIMax series I/O modules (X-DI6401, X-DI3201, X-DO1601).