Rockwell Automation Publication SAFETY-AT134B-EN-P - November 2015
19
Safety Function: Cable Pull Switch with a Configurable Safety Relay
10.
Click Edit Logic to see the online diagnostics.
Green indicates that a block is True or that an input or output terminal is ON. Flashing green indicates that a Safety
Output Function is ready to be Reset.
The online diagnostics mode of the 440C-CR30 relay can be very helpful during the verification process.
11.
Calculation of the Performance Level on page 19
and
Verification and Validation Plan on
before proceeding with
Verification of the Configuration on page 28
.
Calculation of the Performance Level
When properly implemented, these safety functions can achieve a safety rating of Category 3, Performance Level d (CAT.
3, PLd), according to ISO 13849-1: 2008, as calculated by using the SISTEMA software PL calculation tool.
The Performance Level required (PLr) from the risk assessment for each of the safety functions in this application is PLd or
better. Additionally, each safety function must achieve a CAT. 3 rating or better.
The Performance Level and Category achieved by each subsystem of the Lifeline 4 cable pull switch safety function, as
calculated by SISTEMA, is shown below.
