Overview
Manuals
Network Application Architecture
Suffix Codes
Principle
Features:
- ESB Bus Adapter with a built-in Terminator
- Used to terminate loops in high-speed ESB (Extended Serial Backplane) bus systems
- It absorbs signal energy at the end of the line to prevent waveform reflection and data transmission corruption
As a key physical interface in the system, this module is responsible for seamlessly integrating complex input and output signals from the field into the ESB extended bus network. It not only ensures high-frequency, stable bidirectional transmission of massive amounts of industrial data between the control layer and field I/O modules, but also significantly improves the real-time response speed and multi-node collaboration capabilities of the entire distributed system.
In addition to basic signal connection functions, the A2EE1A-T integrates crucial bus termination impedance matching. In distributed industrial networks, long-distance transmitted electrical signals are highly susceptible to waveform reflections at bus termination points, leading to data loss or communication distortion. The A2EE1A-T addresses this issue with a built-in precision terminating resistor, specifically deployed at the physical end of the bus to absorb residual electromagnetic signals.
The A2EE1A-T YOKOGAWA Connector unit with terminator for ESB Bus may still be available for purchase and support from Moore Automated Company beyond End-Of-Life (EOL) by the manufacturer (OEM).
YOKOGAWA A2EE1A-T Connector unit with terminator for ESB Bus DATASHEET(manual), Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
In a standard CENTUM VP network star or chain topology, the A2EE1A-T is installed in the last terminal slot of the ESB node branch. It connects the remote I/O chassis back to the main field control unit (FCU) via a physical copper ESB bus, thereby establishing reliable communication integrity in long-distance cabinet cabling.
The meanings of the suffix codes (A2EE1A-N and A2EE1A-T) are as follows: Yokogawa provides two main configuration options for A2EE1A:
A2EE1A-N: Standard bus connector unit for bus relays.
A2EE1A-T: Connector unit with terminating resistors, typically installed at the end of an ESB bus link to match impedance and eliminate physical signal reflections.
The A2EE1A-T operates based on transmission line impedance matching and differential signal transmission technology. When the controller's electrical signals are transmitted to the adapter via the ESB bus cable, it first utilizes dedicated physical interface circuitry to precisely route the data flow and provide electrical isolation.
When a high-frequency pulse signal reaches the end of the bus physical topology, the A2EE1A-T's built-in terminating resistor perfectly matches its internal impedance to the characteristic impedance of the bus cable (typically a specific high-frequency impedance value).
At this point, the energy of the forward-transmitting electrical signal is completely absorbed by the terminating resistor and converted into a small amount of heat, thereby completely preventing electromagnetic waves from being reflected back to the signal source, maintaining the stability of the entire control bus voltage waveform, and ensuring the accuracy of data interpretation.
