Ayman Elotaify

To say that your program is a fail safe program, you have to follow the safety rules.

Programming rules, is to use certified blocks and software packages like safety matric or CFC.

please have a look onAnnex 1to know which modules and block you have to use.

If you bought fail safe modules and built your own fuctions or function blocks (standard programming), then you doesn't have a fail safe system.

Hope this helps.

just a clarification inbetween sir, can we use standard blocks(valve and motor blocks) from the APL v8.0 library for programming in our fail safe systems along with F channel drivers complying with SIL requirements

S7-FreshMan

Could you please send me the reference of the document you mean ?

thanks in advance,

S7 AUTOMAN

just a clarification inbetween sir, can we use standard blocks(valve and motor blocks) from the APL v8.0 library for programming in our fail safe systems along with F channel drivers complying with SIL requirements

S7-FreshMan

Could you please send me the reference of the document you mean ?

thanks in advance,

Madhava

You can find the limitations / difference between normal and safety program herein the chapter 4.14

Regards SIL 2/3 restriction I will discuss with my colleagues here and update you if I got more inputs.

Ayman Elotaify

S7 AUTOMAN

Ayman Elotaify

To say that your program is a fail safe program, you have to follow the safety rules.

Programming rules, is to use certified blocks and software packages like safety matric or CFC.

please have a look onAnnex 1to know which modules and block you have to use.

If you bought fail safe modules and built your own fuctions or function blocks (standard programming), then you doesn't have a fail safe system.

Hope this helps.

hiAyman Elotaify,

just a clarification inbetween sir, can we use standard blocks(valve and motor blocks) from the APL v8.0 library for programming in our fail safe systems along with F channel drivers complying with SIL requirements

Hello,

You can create valve or motor function yourself using failsafe blocks if you used CFC programming.

Note, it is possible to mix between IO modules. It means that may be there are standard modules and fail safe modules in the same system or even in the same IO rack.

And for standard modules you can program their IOs using standadard programming. Only fail safe modules need to be be programmed using fail safe packages like Safety matrix or CFC.

Hope this helps.