NX-SIH400 Omron 4-Channel Digital Safety Input Module

The Omron NX-SIH400 is a high-performance digital safety input unit engineered for integration into NX-series I/O platforms. With 4 PNP 24 VDC inputs, compact 12 mm width, and screwless push-in terminals, it provides space-saving and tool-free wiring for functional safety applications in demanding automation environments.

Certified up to SIL 3 (IEC 61508) and PLe (ISO 13849-1), the NX-SIH400 enables direct connection of safety devices such as emergency stop switches, safety door sensors, and light curtains to safety controllers via the NX I/O Bus.

Technical Specifications

Model: NXSIH400
Series: Omron NX Safety
Module Type: Safety I/O – Digital Input
I/O System: NX I/O Bus
Mounting Method: DIN rail (via NX-series coupler or CPU)
Weight (Unpacked): 90 g
Dimensions (W × H × D): 12 × 104.5 × 80.1 mm
Protection Rating: IP20
Detachable Connector: Not applicable
Connection Type: Push-in (screwless)

Input Specifications

• Number of Digital Inputs: 4
• Input Type: PNP (Sourcing)
• Input Voltage Range: 20.4 to 28.8 VDC
• Connection Wiring: 4-wire
• Signal Processing Mode: Free running
• Short-Circuit Protection: Not specified
• Input Filtering & Debounce: Handled by safety logic configuration
• Diagnostics: Per input channel (via safety PLC)

Electrical & Safety Ratings

• Power Supply Voltage: Supplied via NX Bus
• Power Consumption: Minimal (drawn from system bus)
• SIL Rating (IEC 61508): SIL 3
• Category (EN ISO 13849-1): Cat. 4
• Performance Level (PL): PLe
• PFHd: <10⁻⁸/h
• TÜV Certification: Yes
• CIP Safety & Functional Safety Compliant: When used with NX-SL5 or SL3 Safety CPU

Environmental Specifications

• Operating Temperature: 0°C to 55°C
• Storage Temperature: –25°C to 70°C
• Humidity (Operating): 10% to 95% RH (non-condensing)
• Vibration Resistance: Conforms to IEC 60068-2-6
• Shock Resistance: 150 m/s² (IEC 60068-2-27)

Compatibility & Integration

• Compatible PLC Systems:
  • Omron NX-Series Safety CPUs (NX-SL3xxx / SL5xxx)
  • Also integrates into Sysmac environments with EtherCAT and Safety over EtherCAT
• I/O Bus Interface: NX I/O Bus via Safety Controller
• Safety Programming Software: Sysmac Studio
• Connection Method: DIN rail attachment with push-in terminals for fast wiring

Application Use Cases

Ideal for:

• Emergency stop and safety gate input detection
• Light curtain or laser scanner input monitoring
• Industrial robotic safety control
• Machine tool safety systems
• Process line safety compliance with ISO 13849-1 / IEC 62061

Key Features & Benefits

✅ Compact 12 mm width saves panel space.

✅ Screwless push-in terminals for fast, tool-free installation.

✅ Certified SIL 3, PLe, suitable for high-risk safety functions.

✅ NX I/O bus compatibility for scalable safety architecture.

✅ Fully supported in Sysmac Studio for seamless programming and diagnostics.

📦 Available Now at Drive Outlet Megastore

The NX-SIH400 is a scalable safety input module that ensures space-saving design, ease of installation, and certified protection for mission-critical safety systems. Suitable for modern machinery and compliant with leading global safety standards.

Need help designing your safety I/O architecture? Contact our engineering support team.

Omron NX Safety – Compact, Reliable, and Certified.

Available at Drive Outlet Megastore.