Red symbol in safety program

[Grzesiuk]

Hello,

Some time ago in one of the projects (S7-300) I have seen a safety marker which had a red background. Could you please tell me, why some bits were red when the others didnt have any backlight in safety program?


https://ibb.co/0rqwx03

 

[JRW]

In Simatic Manager and 300’s...
Red is safety I/O and no color is standard I/O

CFC in 400 HF - safety is yellow

Using TIA Portal- safety is yellow

 

[Grzesiuk]

Well, I am just reading a documentation and that is what I found.

"Note
When F-blocks are being edited in F-FBD/F-LAD in the FBD/LAD Editor, all addresses that
are not fail-safe are shown by default with a yellow background."
The yellow background is used only for F-blocks in this case, as for the symbol that are not safety we are using yellow/red background.

S7_distributed_safety_configuring_and_programming_en_US_en-US - site 129

 

[L D[AR2P#0.0]]

The red colour indicates a non-safe address using Simatic manager for the S7-300 plcs. You can change the colour using Customize>View in the ladder editor.

 

[Grzesiuk]

Thanks, everything is clear now