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ABB TA5142-RS485I: AC500, RS485 Serial
ABB TA5142-RS485I AC500-eCo V3 isolated 2-wire half-duplex EIA RS-485 communication option board with 500 V DC potential separation, configurable bus termination and support for Modbus RTU and CAA SerialCom.
Why Choose the ABB TA5142-RS485I Isolated RS-485 Communication Option Board?
The ABB TA5142-RS485I is a compact isolated RS-485 serial communication option board designed to extend the communication capabilities of compatible ABB AC500-eCo V3 programmable logic controllers. It provides one 2-wire half-duplex EIA RS-485 interface for industrial serial data exchange with compatible drives, HMIs, instruments, controllers and other automation devices.
Designed for ABB AC500-eCo V3 PM50xx CPUs, the TA5142-RS485I supports configurable transmission rates from 9.6 kbit/s to 115.2 kbit/s. Its serial interface is galvanically isolated from the CPU with 500 V DC potential separation, making it particularly suitable where electrical separation between the PLC and serial network is required.
The TA5142-RS485I supports programmable communication using Modbus RTU or CAA SerialCom and incorporates configurable bus termination directly on the option board. TxD and RxD LEDs indicate communication activity, while additional LEDs show the termination configuration. A removable 5-pin spring terminal block with 3.50 mm pitch is supplied for straightforward RS-485 network wiring.
Key Advantages
- Adds one isolated EIA RS-485 interface to compatible ABB AC500-eCo V3 PLCs.
- Provides 500 V DC galvanic isolation from the CPU.
- Supports configurable transmission rates from 9.6 kbit/s to 115.2 kbit/s.
- Supports Modbus RTU master or slave communication.
- Supports programmable serial communication using CAA SerialCom.
- Features built-in configurable RS-485 bus termination.
- Communication and termination LEDs assist commissioning and diagnostics.
- Installs directly into a compatible CPU option-board slot without requiring an external RS-485 converter.
Key Features
- ABB AC500-eCo V3 serial communication option board.
- 1 × EIA RS-485 serial interface.
- 2-wire half-duplex communication.
- 500 V DC potential separation between the interface and CPU.
- 9.6–115.2 kbit/s configurable transmission rate.
- Serial interface parameters configurable through software.
- Data exchange operating mode.
- Programmable protocol support.
- Supports Modbus RTU and CAA SerialCom.
- Integrated configurable bus termination.
- TxD and RxD communication status LEDs.
- Dedicated LEDs for bus termination status.
- Removable 5-pin spring/cable front terminal block.
Isolated RS-485 Communication for AC500-eCo V3 PLCs
RS-485 is widely used for industrial serial networks because multiple compatible devices can communicate over a differential two-wire bus. The ABB TA5142-RS485I adds this capability directly to compatible AC500-eCo V3 CPUs while providing 500 V DC galvanic separation between the communication interface and controller electronics.
The option board can be configured for Modbus RTU master or slave operation and also supports custom serial communication through CAA SerialCom. Integrated configurable bus termination simplifies network installation, while separate TxD, RxD, 120R and PUD status LEDs provide useful visual feedback during commissioning and troubleshooting.
Typical Applications
- Modbus RTU industrial networks.
- Variable speed drive communication.
- Industrial HMI and operator interface integration.
- Energy meter and power monitoring communication.
- Serial instrumentation and measurement systems.
- Multi-device RS-485 automation networks.
- Custom serial communication using CAA SerialCom.
- OEM control panels using ABB AC500-eCo V3 PLCs.
Technical Specifications
| Manufacturer | ABB |
|---|---|
| Series | AC500-eCo V3 |
| Model | TA5142-RS485I |
| ABB order code | 1SAP187300R0002 |
| Product type | Isolated RS-485 serial communication option board |
| Number of serial interfaces | 1 |
| Serial interface standard | EIA RS-485 |
| Communication type | 2-wire half-duplex |
| Potential separation | Yes, 500 V DC from CPU |
| Transmission rate | 9.6–115.2 kbit/s |
| Serial interface parameters | Software configurable |
| Operating mode | Data exchange |
| Protocol | Programmable |
| Supported protocols | Modbus RTU / CAA SerialCom |
| Modbus RTU operation | Master or slave |
| Bus termination | Built-in and configurable |
| Communication indication | TxD and RxD LEDs |
| Termination indication | 120R and PUD LEDs |
| Connection | Removable 5-pin spring terminal block |
| Terminal pitch | 3.50 mm |
| Terminal 1 | A1, internally connected to A2 |
| Terminal 2 | B1, internally connected to B2 |
| Terminal 3 | GND |
| Terminal 4 | A2, internally connected to A1 |
| Terminal 5 | B2, internally connected to B1 |
| Compatible CPUs | ABB AC500-eCo V3 PM50xx |
| Internal power supply | Via internal CPU connection |
| Additional CPU supply current consumption | max. 25 mA from 24 V DC CPU supply |
| Configuration software | ABB Automation Builder |
| Weight | approx. 16 g |
| EAN | 4013614551833 |
| HS Code | 85389091 |
| Country of Manufacture | Germany |
Frequently Asked Questions
What is the ABB TA5142-RS485I used for?
The TA5142-RS485I is an isolated RS-485 serial communication option board used to add one 2-wire half-duplex EIA RS-485 interface to compatible ABB AC500-eCo V3 programmable logic controllers.
Is the TA5142-RS485I galvanically isolated?
Yes. ABB specifies 500 V DC potential separation between the RS-485 interface and the CPU, distinguishing the TA5142-RS485I from the non-isolated TA5142-RS485.
What communication speed does the TA5142-RS485I support?
The TA5142-RS485I supports configurable transmission rates from 9.6 kbit/s to 115.2 kbit/s.
Does the TA5142-RS485I support Modbus RTU?
Yes. The TA5142-RS485I supports Modbus RTU master or slave communication and can also be used for programmable serial communication through CAA SerialCom.
Does the TA5142-RS485I have built-in bus termination?
Yes. The RS-485 option board incorporates configurable bus termination, with dedicated 120R and PUD LEDs providing visual indication of the termination configuration.
Reliable Isolated RS-485 Communication from ABB
The ABB TA5142-RS485I provides compatible AC500-eCo V3 controllers with an isolated 2-wire half-duplex RS-485 interface, combining 500 V DC potential separation, configurable bus termination and programmable Modbus RTU or CAA SerialCom communication in a compact option-board format.
