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2
SYSTEM CONFIGURATION
2.3 Module Replacement
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2.3
Module Replacement
Replace the product according to the replacement cycle shown in the table below.
2.4
Precautions for Use
Users must prove that their entire safety system complies with the safety standards and
the Machinery Directive. The third-party certification organization will validate the safety of
product for the entire safety system, including a safety relay module and safety
components.
To establish a safety system, calculate the target performance level (PL) for each safety
application (safety function) based on the MTTFd and DCavg values of the safety relay
module and connected safety components. The calculation equation is shown in
ISO13849-1:2006.
the Machinery Directive. The third-party certification organization will validate the safety of
product for the entire safety system, including a safety relay module and safety
components.
To establish a safety system, calculate the target performance level (PL) for each safety
application (safety function) based on the MTTFd and DCavg values of the safety relay
module and connected safety components. The calculation equation is shown in
ISO13849-1:2006.
MTTFd and DCavg of the safety relay module are shown in following.
Table 2.3 Module replacement cycle
Module
Module replacement cycle
Q series/CC-Link/Extension safety relay module
10 years
Table 2.4 MTTFd and DCavg of the safety relay module
Module
MTTFd
DCavg
Safety relay module
>100 years
99%