External Safety Circuit Examples; Performance Level - Omron SCARA YRC Series Supporting Supplement Manual

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User manual (102 pages)

Table Of Contents

Table of Contents

This section describes category-specific safety circuit configuration examples using the PB.

Customers should install the appropriate safety measures for their system by referring to the circuit example for each

controller, in order to use the robots more safely.

3.1

To comply with the machinery directives, the "performance level (PL)" required of the safety circuit must be evaluated.

Performance levels (PL) are determined by the following parameters:

● Major factors that determine performance levels

1. Category

2. MTTFd (Mean Time To Dangerous Failure)

3. DCavg (Average Diagnostic Coverage)

4. CCF (Common Cause Failure)

(Please obtain the data on each component from the component manufacturer.)

The performance level (PL) of a safety circuit is determined by the following flow.

● Flow for determining performance levels

1. Determine the "performance level (PLr) required of the safety circuit" by means of risk assessment.

2. Configure the safety circuit that satisfies the requirements of the category that meets PLr.

3. Calculate the safety circuit's "performance level (PL)" from the MTTFd, DCavg, and CCF of the devices used for the safety

circuit, and then make sure that the calculated PL is equal to or higher than the "performance level (PLr) required of the safety

circuit" (PLr ≤ PL).

In the customer's final system, the performance level (PLr) required of the safety circuit should be determined

by means of risk assessment, and then the safety circuit with the corresponding performance level (PL) should

be configured.

● Safety parts subject to performance level calculation

The table below shows the safety parts and B10d reference values.

CAUTION

Please obtain the latest information from the parts manufacturers.

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