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- Yokogawa
- ADM55R-S2
- Relay Output Module
- Japan
- 130 × 100 × 50 mm
- 0.6 kg
- Xiamen, China
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Product Overview
The Yokogawa ADM55R-S2 Relay Output Module is a high-reliability digital relay output module designed for Yokogawa CENTUM Distributed Control Systems (DCS). It is used to convert control signals from the DCS into isolated ON/OFF relay outputs, enabling direct switching of field devices such as valves, solenoids, alarms, motors, and interlock systems.
The S2 version is an industrial-grade configuration optimized for stable switching performance, electrical isolation, and continuous operation in harsh environments. It is widely used in process automation systems where safe and dependable output execution is required.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Yokogawa |
| Model | ADM55R-S2 |
| Product Type | Relay Output Module |
| Function | Digital relay contact output |
| System Compatibility | CENTUM CS / CENTUM VP |
| Output Channels | 16 channels (typical configuration for R-series) |
| Output Type | Relay contact output (isolated) |
| Output Rating | 250 V AC / 125 V DC / 24 V DC industrial switching range |
| Contact Form | Form A / Form B relay contacts (application dependent) |
| Response Time | ≤ 10 ms |
| Return Time | ≤ 10 ms |
| Isolation | Channel-to-channel and system isolation |
| Power Supply | 5 V DC (via system backplane) |
| Power Consumption | ≤ 2 A |
| Mounting Type | Rack-mounted / I/O module nest |
| Dimensions (H × W × D) | 130 × 100 × 50 mm |
| Weight | 0.6 kg |
Function and Working Principle
The ADM55R-S2 operates as a relay-based output execution module in a distributed control system.
Its working process includes:
- Receiving output commands from the DCS controller
- Activating internal relay coils via backplane signals
- Switching external field circuits through dry contacts
- Providing electrical isolation between control system and field devices
- Ensuring stable ON/OFF operation under industrial conditions
This design allows safe control of high-voltage or high-current field equipment without exposing the control system directly.
Role in Industrial Control Systems
Within Yokogawa CENTUM architecture, the ADM55R-S2 functions as a critical digital output interface module.
Its key roles include:
- Driving field actuators such as valves, pumps, and solenoids
- Executing control logic output signals in real time
- Supporting alarm and shutdown signal activation
- Ensuring safe isolation between control system and field wiring
- Providing reliable switching in continuous industrial operation
It is an essential component for process execution and automation safety.
Industrial Applications
The ADM55R-S2 is widely used in:
- Oil and gas processing systems
- Petrochemical and refinery plants
- Power generation facilities
- Chemical processing industries
- Water treatment systems
- Safety instrumented systems (SIS)
It is especially suitable for applications requiring robust relay switching and high electrical isolation reliability.
Installation and System Integration
Proper installation ensures stable performance:
- Installed in Yokogawa DCS I/O racks or relay nests
- Connected via system backplane interface
- Requires correct channel configuration in engineering tools
- Field wiring must follow industrial safety standards
- Integrated using CENTUM system configuration software
Correct setup ensures stable output switching and long-term operational reliability.
Compatible System Components
The ADM55R-S2 typically works with:
- Yokogawa CENTUM controllers
- Field Control Stations (FCS)
- Human Interface Stations (HIS)
- Solenoids, relays, motors, and actuator systems
- Alarm and interlock modules
These components form a complete industrial automation output system.
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| Yokogawa ADM55R | Relay Output Module | Standard version | General control |
| Yokogawa ADM55-2 | Relay Output Module | Enhanced relay design | Stable switching systems |
| Yokogawa ADM52C Series | Contact Output Module | Higher channel density | Large-scale systems |
| Yokogawa ADM52-1 | Contact Output Module | Robust output control | Process automation |
| Yokogawa ADV Output Series | Digital Output Modules | Modular architecture | Complex distributed systems |
Key Advantages
- Reliable relay contact output switching
- Strong electrical isolation for system safety
- Stable performance in industrial environments
- Fast response for real-time control
- Suitable for high-voltage industrial loads
- Easy integration with Yokogawa CENTUM systems
- Supports continuous 24/7 operation
Technical FAQs
Q1: What is the main function of ADM55R-S2?
It converts DCS control signals into relay contact outputs for controlling field devices.
Q2: How many channels does it support?
It typically supports 16 relay output channels.
Q3: What devices can it control?
It can control valves, alarms, solenoids, motors, and interlocks.
Q4: Is it suitable for safety systems?
Yes, it is widely used in safety instrumented systems (SIS).
Q5: What is the difference between ADM55R and ADM55R-S2?
The S2 version is an enhanced configuration with improved stability and industrial-grade reliability.
Conclusion
The Yokogawa ADM55R-S2 Relay Output Module is a robust and reliable industrial output solution designed for precise ON/OFF control of field devices. With strong isolation, stable relay switching performance, and seamless integration into Yokogawa CENTUM systems, it ensures safe and efficient process execution.
It is widely used in industries where process reliability, electrical safety, and continuous automation performance are critical.