A：
Level 2 safety light curtains have the following characteristics:
1. Low cost: Level 2 safety light curtains are generally affordable compared to higher level light curtains.
2. Performance: Level 2 light curtains typically utilize a single CPU processor for their operation.
3. Dual safety channel outputs: They provide two separate output channels for enhanced safety redundancy and reliability4. Self-diagnosis or external periodic testing: Level 2 light curtains can perform self-diagnosis or be externally tested at regular intervals to check for any faults or malfunctions.
5. Fault exclusion method for safety performance: These light curtains employ fault exclusion techniques to ensure that they maintain their safety performance even in the presence of potential faults or failures.
6. Application range: Level 2 safety light curtains are suitable for use in situations or machines where the risk of injury is moderate or low. They are commonly used in automated production equipment, material handling devices, and similar applications.
Level 4 safety light curtains have the following characteristics:
1. Higher cost: Level 4 safety light curtains are generally more expensive compared to lower level light curtains due to their advanced features and performance.
2. Performance: Level 4 light curtains typically utilize dual CPU processors for increased processing power and reliability.
3. Dual safety channel outputs: Similar to level 2 light curtains, they provide two separate output channels for enhanced safety redundancy and reliability.
4. More reliable control, less susceptible to interference: Level 4 light curtains are designed to be less affected by ambient light or other sources of interference, ensuring more reliable operation.
5. Self-diagnosis and advanced fault detection: They incorporate self-diagnosis capabilities for fault checking and may have additional features such as higher-level redundant fault cross-checking.
6. Application range: Level 4 safety light curtains are suitable for use in high-risk environments or machines where the potential for serious injury is greater. They provide effective protection for dangerous areas.
