B&R 8AC140.61-3 AC140 ACOPOS CAN Communication Module
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Product Information
The B&R 8AC140.61-3 is an AC140 CAN bus communication option module engineered for B&R ACOPOS servo drive systems. Functioning as a high-performance network interface, this plug-in module enables ACOPOS drives to integrate directly into a CAN fieldbus architecture managed by a central PLC or motion controller. Formed to fit option slot 1 or slot 2 of the drive controller, the unit establishes stable multi-axis drive synchronization and command transmission across demanding automation systems such as packaging machinery, material handling equipment, plastics processing, and injection molding platforms.
Physical fieldbus wiring connects directly through two onboard RJ45 sockets, enabling direct daisy-chaining between adjacent drive nodes without requiring external splitters or T-junctions. The module features a galvanically isolated CAN interface supporting configurable baud rates from 10 kbit/s to 1 Mbit/s using standard CAN 2.0B and CANopen profiles. Commissioning a replacement unit is straightforward within the B&R Automation Studio engineering environment, as parameters stored in the main ACOPOS drive controller or supervisory PLC are restored automatically upon installation. For fast turnaround during machine downtime, ABC Industrial Parts provides tested replacement units to ensure seamless reintegration with existing drive parameters.
Real-time diagnostic feedback is provided by front-facing RDY and ERR status LEDs, which indicate module operational readiness and fieldbus error conditions. Detailed diagnostics and register status can be monitored online through B&R Automation Studio or evaluated via PLC diagnostic blocks. When experiencing bus faults or node dropouts, initial checks should verify module seating in option slot 1 or 2, check that 120-ohm bus termination resistors are present at physical network endpoints, and confirm proper shield grounding. Persistent module identification errors or internal hardware failures cannot be repaired in the field, making unit replacement or sourcing a tested spare through ABC Industrial Parts the quickest solution to resume production.
Technical Specifications
| Manufacturer | B&R Industrial Automation |
| Part Number | 8AC140.61-3 |
| Model / Type | AC140 |
| Product Family | ACOPOS |
| Component Type | Communication Module |
| CAN Interfaces | 1 |
| Network Connectors | 2x RJ45 |
| Minimum Baud Rate | 10 kbit/s |
| Maximum Baud Rate | 1000 kbit/s |
| Galvanic Isolation | Yes |
| Supported Protocols | CAN 2.0B, CANopen |
Programming and Configuration
Hardware setup and network parameterization for the B&R 8AC140.61-3 are managed directly inside the B&R Automation Studio engineering software. Operating within standard CAN 2.0B and CANopen fieldbus profiles, the module allows engineers to configure node identifiers, transmission cycle times, and operational communication parameters tailored to the motion profile of the drive.
Configurable transmission speeds range from 10 kbit/s up to 1 Mbit/s, matching network cycle demands to distance and cable length requirements. During maintenance operations, replacing a unit does not require manual software re-flashing because configuration data and operational parameters stored in the drive controller or master PLC automatically transfer to the new module during initialization.
Communication and System Integration
The 8AC140.61-3 provides a galvanically isolated CAN fieldbus interface designed to protect sensitive drive electronics from high-voltage transients, electrical noise, and ground loops common in high-power motor control environments. This high level of noise immunity ensures consistent communication reliability between the supervisory PLC and ACOPOS servo drives.
Network wiring is simplified by dual RJ45 connectors integrated onto the front panel of the module. These internally connected ports allow linear daisy-chain topology across multiple ACOPOS drive nodes in multi-axis motion systems. By eliminating the need for external T-connectors, network splitters, or junction blocks, machine cabling remains compact and organized.
Diagnostics and Status Indication
Visual monitoring is provided by front panel status LEDs labeled RDY and ERR. The RDY LED indicates module operational readiness, while the ERR LED alerts operators to fieldbus communication errors or module faults. In addition to physical LEDs, technical staff can perform online register readings and trace diagnostics directly within B&R Automation Studio or execute PLC diagnostic blocks to evaluate fieldbus communication status.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| RDY | Module operational readiness indicator | |
| ERR | Module or communication error indicator |
Replacement and Spare Part Considerations
When replacing an 8AC140.61-3 module, verify that the physical part number matches exactly and ensure the replacement card is fully seated in slot 1 or slot 2 of the ACOPOS servo drive before securing the mounting screws. Loose mechanical seating or incorrect project configuration in B&R Automation Studio can trigger module identification errors such as fault codes 1008 or 1009.
Network integrity should be verified by checking RJ45 patch cabling, shield grounding, and ensuring 120-ohm line termination resistors are correctly placed at both physical ends of the CAN bus line. Because fieldbus configuration data is retained in the ACOPOS drive or supervisory PLC memory, swapped hardware automatically receives network parameters upon power-up once physical connections and baud rates are established.
Error Codes & Fault Codes
The following error codes may be displayed during operation or diagnostics:
| Code | Name | Description | Possible Cause | Recommended Action |
|---|---|---|---|---|
| 1008 | ACOPOS plug-in module in slot 1 not identified / invalid | The drive controller cannot identify the module in slot 1 or detected an incompatible plug-in module. | Module not fully seated, defective plug-in module, or incorrect hardware module configuration in project. | Check module seating and screws. Verify hardware configuration in Automation Studio. If persistent, replace module (internal hardware failure). |
| 1009 | ACOPOS plug-in module in slot 2 not identified / invalid | The drive controller cannot identify the module in slot 2 or detected an incompatible plug-in module. | Module not fully seated, defective plug-in module, or incorrect hardware module configuration in project. | Check module seating and screws. Verify hardware configuration in Automation Studio. If persistent, replace module (internal hardware failure). |
| 32001 | CAN bus failure / bus off state | The CAN controller went into Bus Off state due to too many transmission/reception error frames. | Faulty CAN network cabling, incorrect termination resistors, wrong baud rate, or electrical interference. | Check RJ45 network cabling and shielding. Ensure 120 ohm line termination resistors are present at both physical ends of the CAN bus. Check configured baud rate. |
| 32002 | CAN bus error warning level reached | The CAN controller internal error counter exceeded the warning threshold. | Loose connector, shield grounding problem, bus line interference, or wrong network parameters. | Inspect RJ45 plugs, check shield connections to ground, verify cable routing away from power lines. |
| 32011 | CAN network timeout | No valid CAN message was received within the configured watchdog period. | Master PLC stopped, network cable disconnected, or power lost on master node. | Verify CAN master status, check RJ45 connectivity and cable continuity. |
Frequently Asked Questions
What is the function of the B&R 8AC140.61-3 module?
The B&R 8AC140.61-3 AC140 module is a CAN bus communication option card that plugs into B&R ACOPOS servo drives. It provides a galvanically isolated interface for exchanging drive parameters, status monitoring, and synchronized control with a central PLC over CAN 2.0B or CANopen networks.
Does replacing the 8AC140.61-3 require manual program reloading?
No, replacing the module does not require manual software loading. Operational parameters and configuration data stored in the ACOPOS drive controller or supervisory PLC are automatically transferred to the replacement module during initial power-up.
How are multiple ACOPOS drives connected using this CAN module?
The module features two internally connected RJ45 connectors on the front panel. This permits linear daisy-chaining between consecutive ACOPOS drive nodes using standard patch cables, eliminating the need for external T-splitters or distribution blocks.
What communication speeds are supported by the 8AC140.61-3 interface?
The module supports configurable CAN bus transmission rates ranging from 10 kbit/s up to 1000 kbit/s (1 Mbit/s).
What steps should be taken if fault code 32001 (CAN bus failure) occurs?
Check all RJ45 cable connections, inspect shield grounding to avoid electrical interference, confirm that the configured baud rate matches the master PLC, and ensure that 120-ohm termination resistors are installed at both physical ends of the CAN bus.
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