Description
YOKOGAWA S2BN5D-121 DO Product Overview
The YOKOGAWA S2BN5D-121 DO is a high-performance digital output module designed for integration with Yokogawa’s industrial automation and control systems. This robust module provides reliable discrete (ON/OFF) control signals to field devices such as solenoid valves, motor starters, and relays in demanding process environments.
Key Features
16-channel digital output module
Form C relay contacts (SPDT configuration)
High-density design for space efficiency
Hot-swappable for maintenance without system shutdown
Advanced diagnostics for predictive maintenance
Technical Specifications
| Parameter | Specification |
| Model | S2BN5D-121 DO |
| Manufacturer | YOKOGAWA |
| Type | Digital Output Module |
| Channels | 16 |
| Contact Type | Form C (SPDT) |
| Contact Rating | 2A @ 30V DC / 0.5A @ 125V AC |
| Isolation | 1500V AC channel-to-channel |
| Response Time | ≤10ms |
| Operating Temperature | -20°C to +60°C |
| Power Supply | 24V DC ±10% |
| Communication | Yokogawa proprietary bus |
| Mounting | DIN rail or panel mount |
| Dimensions | 45mm (W) × 130mm (H) × 120mm (D) |
YOKOGAWA S2BN5D-121 DO
Main Features & Benefits
1. Reliable Switching Performance
Form C contacts provide flexible NO/NC configuration
2A contact rating for driving various field devices
1500V isolation between channels for safety
2. Advanced Diagnostics
LED status indicators per channel
Contact wear monitoring for predictive maintenance
Open/short circuit detection
3. System Integration
Seamless integration with CENTUM VP and ProSafe-RS
Hot-swappable design minimizes downtime
Compact form factor saves panel space
Application Field
Process Industries
Oil & Gas: Emergency shutdown systems
Chemical Plants: Valve control sequences
Power Generation: Turbine auxiliary controls
Manufacturing Automation
Conveyor system controls
Machine safety interlocks
Pump start/stop sequences
YOKOGAWA S2BN5D-121 DO
Related Products
| Model | Description |
| S2BN5D-122 DO | Higher current version (5A contacts) |
| S2BN5D-120 DI | Complementary digital input module |
| FCS401 | Field control station |
| HIS4000 | Operator interface station |
| YPS100 | System power supply |
Installation & Maintenance
Installation Guidelines
Mount on DIN rail with proper spacing
Verify load compatibility before connection
Follow grounding requirements for noise immunit
Maintenance Recommendations
Annual contact resistance check
Monitor LED status indicators
Replace after 100,000 operations for critical applications
