FAIL SAFE AQ MODULE SIEMENS

Hi,

I have some questions regarding the control panel SIL certification.

As per the client's specifications, PLC redundancy (including CPU, critical I/O, communication, and power supplies) is required, along with SIL certification for the entire system. The SIL requirements apply to the controller, programming software, I/O modules, relays, and termination boards.

I have selected the CPU 1518HF and SIPLUS ET 200SP IM155-6PN R1 with SIL 3-certified fail-safe modules (DI, DO, and AI), and I plan to implement redundancy using the RedIo Library. However, I could not find any fail-safe analog output modules. If I use standard analog output modules, will the panel still pass SIL certification? 

Note: Analog output is used for the regulation of valve's position.

AutoGen_2969405

Hi,

I have some questions regarding the control panel SIL certification.

As per the client's specifications, PLC redundancy (including CPU, critical I/O, communication, and power supplies) is required, along with SIL certification for the entire system. The SIL requirements apply to the controller, programming software, I/O modules, relays, and termination boards.

I have selected the CPU 1518HF and SIPLUS ET 200SP IM155-6PN R1 with SIL 3-certified fail-safe modules (DI, DO, and AI), and I plan to implement redundancy using the RedIo Library. However, I could not find any fail-safe analog output modules. If I use standard analog output modules, will the panel still pass SIL certification? 

Note: Analog output is used for the regulation of valve's position.

 Hello,

There are no Fail safe AO modules.

Same issue discussed here: why we don't have fail safe analog output module.

Hi,

Thank you for your response.

Is I/O redundancy possible with the above-mentioned PLC system?