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- SEC401-51
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- Japan
- 123 mm × 30 mm × 100 mm
- 0.18kg
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📘 Product Introduction — SEC401-51
The SEC401-51 is a discrete input module designed for high-reliability industrial control systems. It is part of a larger family of secure I/O modules typically used in safety instrumented systems (SIS) and process control environments where precise digital signal detection is essential. This model receives discrete (digital) signals from field equipment such as switches, relays, or contact closures, and transmits them to a central controller or safety logic solver.
The SEC401-51 is engineered with robust isolation, fast response time, high input channel density, and long-term durability. It is commonly installed in control cabinets and is suitable for harsh environments, making it ideal for safety-critical operations.
📊 Technical Specifications – SEC401-51
| Parameter | Specification |
|---|---|
| Model | SEC401-51 |
| Module Type | Discrete Input Module |
| Input Type | Dry Contact or Voltage Input (12 V / 24 V DC, configurable) |
| Number of Channels | 16 digital input channels |
| Input Voltage Range | 0–30 V DC |
| Input Logic Level | ON > 10 V DC; OFF < 3 V DC |
| Input Current | Approx. 3 mA per channel |
| Response Time | < 5 ms |
| Isolation Voltage | 1500 V AC between field and system |
| Internal Power Supply | 5 V logic internally regulated |
| Power Consumption | Approx. 4 W |
| Mounting | DIN rail or backplane (modular system) |
| Status Indicators | LED per channel |
| Diagnostic Features | Channel failure detection, short/open circuit detection |
| Operating Temperature | –10°C to +60°C |
| Storage Temperature | –40°C to +85°C |
| Humidity | 5%–95% RH, non-condensing |
| Protection Rating | IP20 |
| Dimensions (H × W × D) | 123 mm × 30 mm × 100 mm |
| Weight | 0.18 kg |
🏭 Applications
-
Safety Instrumented Systems (SIS)
Used to receive discrete signals from field switches or emergency shutdown equipment. -
Process Control Systems
Interfaces with limit switches, push-buttons, and relay outputs to monitor machine states. -
Alarm and Trip Circuits
Suitable for high-integrity circuits where accurate signal detection is critical. -
Interlocking Logic Systems
Ensures system safety via reliable digital inputs from mechanical or electrical interlocks. -
Hazardous Area Monitoring
Interfaces with intrinsically safe circuits or safety barriers for monitoring field conditions.
✅ Key Advantages
-
High Channel Density
16 channels per module reduce cabinet space and wiring complexity. -
Fast and Stable Detection
Rapid response (< 5 ms) ensures real-time monitoring and fast system reactions. -
Industrial Durability
Designed to perform reliably in temperature extremes and high-vibration environments. -
Signal Integrity
Excellent isolation and diagnostic capability prevent faults and improve uptime. -
Simple Maintenance
Channel LEDs and diagnostics assist with quick fault localization and maintenance.
🏷️ Brand and Series Information
| Field | Description |
|---|---|
| Brand | Yokogawa |
| Series | SEC Series (Secure Input Modules) |
| Module Category | Digital / Discrete Input |
| System Integration | DCS, SIS, Safety PLCs |
| Application Level | Industrial Automation / Safety |
🔁 Related Models (Same Series / Similar Function)
| Model | Function Type | Channels | Dimensions (mm) | Weight (kg) | Key Feature |
|---|---|---|---|---|---|
| SEC401-11 | Discrete Input | 16 | 123 × 30 × 100 | 0.18 | Basic version without diagnostics |
| SEC401-51 S1 | Discrete Input | 16 | 123 × 30 × 100 | 0.18 | Enhanced diagnostics version |
| SEC402-51 | Discrete Output | 16 | 123 × 30 × 100 | 0.20 | Output relay contacts |
| SEC410-51 | Mixed Input/Output | 8/8 | 123 × 30 × 100 | 0.22 | For compact control panels |
| SCP451-11 | Safety Logic Processor | — | 123 × 122 × 100 | 1.2 | Used as the logic solver for SEC I/O |
🔝 Popular Models from the Same Brand
| Model | Function Type | Dimensions (mm) | Weight (kg) | Description |
|---|---|---|---|---|
| SCP451-53 | Analog Output Module | 123 × 122 × 100 | 1.5 | Multiple channel analog output for control use |
| ADV151-P00 | Digital Output Module | 123 × 122 × 100 | 0.9 | High-speed digital output card |
| CP701 | Main Control Processor | 200 × 100 × 50 | 1.7 | Central CPU unit for system-wide coordination |
| SEC402-51 | Discrete Output Module | 123 × 30 × 100 | 0.20 | Outputs control logic to actuators |
| VI702 | Communication Module | 110 × 90 × 40 | 0.6 | Enables system integration via Ethernet/Vnet |
❓ 10 x FAQ (Q&A Format)
Q1: What type of input signals does the SEC401-51 accept?
A1: It accepts discrete (digital) signals such as dry contacts or voltage signals from push buttons, relays, or limit switches.
Q2: How many input channels are available on this module?
A2: The SEC401-51 provides 16 independent digital input channels.
Q3: Is the module electrically isolated?
A3: Yes, the module provides 1500 V AC isolation between the field input side and the internal logic/system.
Q4: Can this module detect open or short circuits?
A4: Yes, diagnostic capabilities allow it to detect failures such as short or open circuits on input channels.
Q5: What voltage is required for the input signals?
A5: It typically detects voltage inputs between 10 V and 30 V DC. Logic ON is above 10 V, and OFF is below 3 V.
Q6: What are the power requirements for the module?
A6: It uses a 24 V DC system power and consumes around 4 W.
Q7: Is the module suitable for use in safety instrumented systems (SIS)?
A7: Yes, it is designed for high-integrity safety systems and often used in SIL-rated applications.
Q8: How is the module mounted?
A8: It is DIN rail mountable and fits into modular racks used in control cabinets.
Q9: What type of feedback is provided for input signal status?
A9: Each channel includes an LED indicator to show ON/OFF status, aiding in diagnostics and commissioning.
Q10: Is the module resistant to industrial environments?
A10: Yes, it is rated for –10°C to +60°C and can operate in up to 95% humidity without condensation.
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