CM202 CANopen Master Module | BACHMANN

Configured for high-speed fieldbus communication in M1 automation platforms, the BACHMANN CM202 (CM202 CANopen Master Module) provides direct physical/electrical execution of CAN network management and data telegram routing.

Hardware Specifications

Backplane Bus Communication and Network Determinism

The CM202 module utilizes the Bachmann M1 backplane bus communication velocity to synchronize CANopen data packets with the controller execution cycle. Each module supports up to 8 independent CAN networks per controller, with operation modes configured on a per-network basis. The module handles SDO, LMT, LSS, and emergency message processing via an extensive API. Network deterministic performance is maintained through strict timing controls, with maximum node counts and cable lengths governed by the selected baud rate to minimize bus latency and collision overhead.

Frequently Asked Questions

Q: Does the CM202 support hot-swapping while the controller is operational?

A: No, the module does not support live hot-swapping; the controller power must be cycled or the specific bus segment must be offlined to ensure system bus integrity during installation.

Q: How does the CM202 ensure electrical protection against bus faults?

A: The module is designed with galvanic isolation for all field connections and includes short-circuit-proof outputs to prevent localized bus faults from propagating to the controller backplane.

Q: Can multiple CM202 modules operate concurrently on a single M200 controller?

A: Yes, up to 4 CM202 modules can be installed on a single M200 controller, supporting a total of up to 8 independent CAN networks.

Field Installation Guidelines

1. Bus Termination: Ensure that 120 Ohm terminating resistors are installed at both extreme ends of the CAN bus trunk to prevent signal reflections and data corruption.
2. Cable Shielding: Utilize twisted-pair shielded cabling for all CAN network segments. Connect the cable shield to a high-frequency earth potential at the entry point of the control cabinet to minimize electromagnetic interference (EMI).
3. Grounding: Verify that the module's functional earth connection is secure to maintain the effectiveness of the galvanic isolation barrier.
4. Wiring Topology: Maintain a daisy-chain topology for the CAN network; avoid long stubs or T-connections to prevent signal degradation at higher baud rates (above 500 Kbaud).