- System stability depends on the communication protocol and is susceptible to interference.
A typical single-unit light barrier requires only a transmitter and receiver pairing, making signal transmission simple and stable.
Cascaded light barriers rely on bus communication (e.g., long-distance transmission). Improper wiring (e.g., parallel to high-voltage power lines) or strong environmental electromagnetic interference can lead to signal delays and false triggering, requiring additional anti-interference measures (e.g., shielded cables and grounding).
- Initial commissioning is more complex.
Commissioning a single light barrier requires only calibrating the alignment and signal strength of the transmitter and receiver.
Cascaded light barriers require coordinating the address coding and communication parameter synchronization of multiple units, and ensuring that the optical axes of all units are aligned (to avoid light leakage or accidental occlusion at joints). This increases commissioning time and requires higher professional expertise from the installer.
- A single point of failure can impact the entire system.
A single light barrier failure only affects its own protected area, while other areas remain operational.
In a cascaded system, a failure in the main controller or communication bus can cause all units to fail. Even a single unit failure (e.g., a damaged transmitter) can trigger a system alarm due to communication interruption, requiring prompt investigation. Lower cost-effectiveness than a single set of light curtains in smaller areas.
If the protection zone only requires 1-2 meters, the hardware (multiple units, bus accessories) and installation costs of a cascaded system are higher than those of a single set of light curtains, representing "overkill."