Sil sick meaning12/20/2023 ![]() ![]() ![]() Probability of Dangerous Failure per Hour (PFHd) 1/hĪvailable SICK Products for Performance Level More specifically, each performance level denotes the probability of dangerous failure per hour (PFHd), seen in the chart below: Like you read earlier, performance levels range from PLa (low) to PLe (high) the higher the risk a machine poses, the higher the performance level it needs. Probability of Dangerous Failure per Hour This brings us to performance level C, which means we need to operate at this level or higher-so anywhere from PLc to PLe. If the possibility of avoiding hazard or limiting harm is scarcely possible, we land at P2. If the frequency and/or exposure to hazard is frequent to continuous, you choose F2. For example, if the severity of injury is slight, you start at S1. Using the corresponding parameters on the chart below, you can determine the required performance level of a machine. Possibility to avoiding hazard or limiting harm F2: Frequent-to-continuous and/or exposure time is longģ.F1: Seldom-to-less-often and/or exposure time is short.S2: Serious (normally irreversible injury or death).The performance level depends on the structure of the control system, the reliability of the components used, the ability to detect faults, as well as the resistance to multiple common faults in multiple channel control systems.ĭetermination of Required Performance Level (PLr)įor each safety function carried out by a safety-related parts of a control system, the required performance level (PLr) must be determined, which often follows these three parameters according to ISO 13849-1: A small, slow-moving mobile robot would most likely require a lower performance level (closer to PLa), where a large, fast-moving mobile robot would most likely require a higher performance level (closer to PLe). The performance levels range for PLa to PLe: a being the lowest and e being the highest. Simply put, the higher risk a machine poses, the higher performance level it needs. It’s important to note that the PL must be greater than or equal to the PLr. ![]() The required performance level (PLr) is the mandatory performance level of a machine to reduce risk. The performance level is a discrete level used to specify the ability of the safety related parts of the control system to perform a safety function under foreseeable conditions. What is the performance level (PL) of a machine? ![]()
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