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- Yokogawa
- ACM22 RS-422/485
- Communication Module
- Japan
- 125 x 130 x 248 mm
- 0.14 kg
- Xiamen, China
- New & In Stock
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Product Overview
The Yokogawa ACM22 RS-422/485 Communication Module is a high-reliability serial communication interface module designed for Yokogawa CENTUM Distributed Control Systems (DCS). It enables stable and efficient data exchange between control systems and external devices using RS-422 and RS-485 communication standards.
This module is specifically designed for long-distance, noise-resistant, and multi-device communication, making it suitable for large-scale industrial automation systems. It supports both point-to-point and multi-point configurations, ensuring flexible integration with PLCs, field instruments, and subsystem networks.
With its robust industrial design and strong anti-interference capability, the ACM22 is widely used in environments requiring stable, high-speed serial communication over extended distances.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Yokogawa |
| Model | ACM22 |
| Product Type | Communication Module |
| Function | Serial communication interface |
| System Compatibility | CENTUM VP / CENTUM CS 3000 / ProSafe-RS |
| Communication Interface | RS-422 / RS-485 |
| Communication Mode | Full-duplex (RS-422) / Half-duplex (RS-485) |
| Connection Type | Point-to-point / Multi-point |
| Baud Rates | 1200 / 2400 / 4800 / 9600 / 19200 / 38400 bps |
| Data Format | ASCII / Binary |
| Data Bits | 7 or 8 bits |
| Stop Bits | 1 or 2 bits |
| Parity | None / Odd / Even |
| Transmission Distance | Up to 1200 m |
| Power Supply | 5 V DC (via backplane) |
| Current Consumption | Approx. 1 A |
| Mounting Type | Rack-mounted / cabinet installation |
| Dimensions (H × W × D) | 125 × 130 × 248 mm |
| Weight | 0.14 kg |
Function and Working Principle
The ACM22 RS-422/485 operates as a serial communication gateway module within industrial automation systems.
Its working process includes:
- Receiving data from the DCS controller
- Converting internal system signals into RS-422/RS-485 communication format
- Transmitting data to external devices or field systems
- Receiving response signals from connected equipment
- Processing and returning data to the control system
It supports multi-node RS-485 communication and ensures stable long-distance transmission with strong noise immunity.
Role in Industrial Control Systems
Within Yokogawa CENTUM architecture, the ACM22 functions as a key serial communication interface module.
Its main roles include:
- Integrating external devices into the DCS system
- Enabling long-distance industrial communication
- Supporting multi-device network structures
- Providing stable and synchronized data exchange
- Enhancing system scalability and integration flexibility
It is essential for maintaining reliable communication in distributed control environments.
Industrial Applications
The ACM22 is widely used in:
- Oil and gas processing systems
- Petrochemical and refinery plants
- Power generation facilities
- Industrial automation systems
- SCADA and monitoring platforms
- Large-scale distributed control systems
It is especially suitable for applications requiring long-distance communication and multi-device networking.
Installation and System Integration
Proper installation ensures optimal performance:
- Installed in Yokogawa control system racks or cabinets
- Connected via RS-422 or RS-485 interfaces
- Supports multi-drop RS-485 wiring
- Requires correct baud rate and protocol configuration
- Shielded twisted-pair cables recommended for noise reduction
Correct setup ensures stable communication and minimal signal interference.
Compatible System Components
The ACM22 typically works with:
- Yokogawa CENTUM controllers
- Human Interface Stations (HIS)
- PLC systems and external controllers
- Field instruments and sensors
- Distributed communication subsystems
These components form a complete industrial automation communication network.
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| Yokogawa ACM12 | Communication Module | Long-distance RS-422/485 support | Distributed systems |
| Yokogawa ACM11 | Communication Module | RS-232 interface | Short-distance communication |
| Yokogawa ACM11-S2 | Communication Module | Enhanced serial configuration | Flexible integration |
| Yokogawa ACM21 | Communication Module | RS-232 point-to-point | Simple systems |
| Yokogawa ABC11D | Bus Converter | Redundant architecture | High-availability systems |
Key Advantages
- Supports RS-422 and RS-485 communication standards
- Long-distance transmission up to 1200 meters
- Strong resistance to industrial electrical noise
- Multi-point communication capability
- Stable and reliable data exchange
- Easy integration with Yokogawa CENTUM systems
- Suitable for large-scale distributed networks
Technical FAQs
Q1: What is the main function of the ACM22?
It enables RS-422/RS-485 communication between the DCS and external devices.
Q2: Does it support multi-device communication?
Yes, RS-485 allows multi-point communication with multiple devices.
Q3: What is the maximum transmission distance?
Up to 1200 meters depending on system configuration.
Q4: What is the difference between RS-232 and RS-422/485?
RS-232 is short-distance point-to-point, while RS-422/485 supports long-distance and multi-device communication.
Q5: Where is it typically used?
It is used in industrial automation, DCS systems, and SCADA integration.
Conclusion
The Yokogawa ACM22 RS-422/485 Communication Module is a robust industrial communication solution designed for long-distance and multi-device serial communication. With its strong noise immunity and flexible configuration, it ensures stable and reliable data exchange across distributed control systems.
It is widely used in industrial environments where communication stability, scalability, and long-distance connectivity are critical.