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- Yokogawa
- ACM21 RS-232
- 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 ACM21 RS-232 Communication Module is a compact and reliable serial communication interface module designed for Yokogawa CENTUM Distributed Control Systems (DCS). It provides stable communication between control systems and external devices using the RS-232 serial communication standard.
This module is commonly used for point-to-point communication, enabling data exchange between controllers, host computers, and field devices. It is suitable for integrating legacy equipment and simple serial-based systems into modern industrial automation environments.
With its simple architecture and stable performance, the ACM21 is widely used in applications requiring short-distance, reliable serial communication.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Yokogawa |
| Model | ACM21 RS-232 |
| Product Type | Communication Module |
| Function | Serial communication interface |
| System Compatibility | CENTUM VP / CENTUM CS 3000 |
| Communication Standard | RS-232C |
| Communication Mode | Half-duplex |
| Connection Type | Point-to-point |
| Baud Rates | Up to 19200 bps |
| Data Format | ASCII / Binary |
| Data Bits | 7 or 8 bits |
| Stop Bits | 1 or 2 bits |
| Parity | None / Odd / Even |
| Flow Control | Hardware / Software dependent |
| Transmission Distance | Up to 15 m |
| Power Supply | 5 V DC (backplane powered) |
| 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 ACM21 RS-232 operates as a serial communication bridge module within industrial control systems.
Its working process includes:
- Receiving data signals from the DCS controller
- Converting system data into RS-232 serial format
- Transmitting data to external devices via serial cable
- Receiving response signals from connected devices
- Sending processed data back to the control system
This enables stable and direct point-to-point communication between the control system and external equipment.
Role in Industrial Control Systems
Within Yokogawa CENTUM architecture, the ACM21 functions as a basic serial communication interface module.
Its key roles include:
- Connecting DCS systems to external serial devices
- Enabling communication with host computers and PLCs
- Supporting legacy equipment integration
- Providing stable point-to-point data exchange
- Ensuring reliable short-distance communication
It is widely used in systems requiring simple, direct, and stable serial connectivity.
Industrial Applications
The ACM21 RS-232 module is widely used in:
- Industrial automation systems
- Oil and gas monitoring systems
- Chemical processing plants
- Power generation facilities
- SCADA monitoring systems
- Integration of legacy serial instruments
It is especially suitable for applications requiring short-distance serial communication and simple system integration.
Installation and System Integration
Proper installation ensures stable operation:
- Installed in Yokogawa control system racks
- Connected via RS-232 serial cable
- Requires correct baud rate and parity configuration
- Shielded cables recommended for noise reduction
- Configured using system engineering tools
Correct setup ensures reliable and interference-free communication.
Compatible System Components
The ACM21 typically works with:
- Yokogawa CENTUM controllers
- Human Interface Stations (HIS)
- PLC systems and host computers
- Serial field instruments
- Industrial communication interfaces
These components form a simple and stable industrial communication network.
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| Yokogawa ACM11 | Communication Module | Standard RS-232 interface | General serial communication |
| Yokogawa ACM11-S2 | Communication Module | Enhanced configuration | Flexible integration |
| Yokogawa ACM12 | Communication Module | RS-422/RS-485 support | Long-distance communication |
| Yokogawa ABC11S | Bus Converter | Basic bus communication | Non-redundant systems |
| Yokogawa ACM22 | Communication Module | Multi-interface support | Advanced communication systems |
Key Advantages
- Simple and reliable RS-232 communication
- Stable point-to-point data transmission
- Easy integration with legacy systems
- Compact and lightweight design
- Low power consumption
- Strong compatibility with Yokogawa CENTUM systems
- Ideal for short-distance industrial communication
Technical FAQs
Q1: What is the main function of the ACM21 RS-232?
It enables serial communication between the DCS and external devices.
Q2: What type of communication does it support?
It supports RS-232 point-to-point serial communication.
Q3: What is the maximum communication distance?
Up to 15 meters depending on cable quality and environment.
Q4: Where is it commonly used?
It is used in industrial automation and legacy device integration.
Q5: What is the difference between ACM21 and ACM12?
ACM21 is for short-distance RS-232 communication, while ACM12 supports long-distance RS-422/RS-485 communication.
Conclusion
The Yokogawa ACM21 RS-232 Communication Module is a reliable and compact solution for industrial serial communication. With its simple architecture and stable performance, it ensures efficient point-to-point data exchange between control systems and external devices.
It is widely used in industrial environments where communication simplicity, stability, and legacy system integration are required.