This paper is a compilation based on the typical content of the Wikipedia article “IEC 61496” as of 2025, combined with standard technical knowledge. If you need the exact current text of that Wikipedia page, please enable web search. Otherwise, this serves as a complete academic-style paper on the topic.
| Feature | Type 2 ESPE | Type 4 ESPE | | :--- | :--- | :--- | | | Single-channel (usually). | Dual-channel (redundant). | | Testing | Periodic internal test cycles. | Continuous self-monitoring. | | Fault Tolerance | A single fault may cause loss of safety function until the next test. | A single fault will not cause the loss of safety function. | | Risk Level | Lower risk applications (e.g., entry into a slow-moving area). | High risk applications (e.g., entry into a fast-moving press). | | Cost | Generally lower cost. | Generally higher cost. | iec 61496 wikipedia