Hello everyone,
I am not new to this forum but this is my first post.
At work we are working with a simatic safety PLC. Altough this has great advantages over safety relays, but it has a huge downside to. The customer thinks that everything you program in a safety PLC is safe. But i don't think so.
So he came with the following assignment:
There is an hazardous area surounded by fences. In the hazardous area is riding an ATV wich tranfers pallets from one conveyor to another. In the middle of track there is a light curtain and the hazardous area can be entered from two places trough a door (one on each side of the light curtain).
In normal operation when the doors are closed, the ATV can ride throught the light curtain for delivering the pallets. But when we open a door the conveyors between the door and the light curtain stop working and the light curtain is activated. If then the atv or a person goes trough the light curtain the conveyors on the other side and the atv stop working.
Now my question is:
Can you "mute" a light curtain based on the status of the door.
Is it legally approved or is it safe?
I am not new to this forum but this is my first post.
At work we are working with a simatic safety PLC. Altough this has great advantages over safety relays, but it has a huge downside to. The customer thinks that everything you program in a safety PLC is safe. But i don't think so.
So he came with the following assignment:
There is an hazardous area surounded by fences. In the hazardous area is riding an ATV wich tranfers pallets from one conveyor to another. In the middle of track there is a light curtain and the hazardous area can be entered from two places trough a door (one on each side of the light curtain).
In normal operation when the doors are closed, the ATV can ride throught the light curtain for delivering the pallets. But when we open a door the conveyors between the door and the light curtain stop working and the light curtain is activated. If then the atv or a person goes trough the light curtain the conveyors on the other side and the atv stop working.
Now my question is:
Can you "mute" a light curtain based on the status of the door.
Is it legally approved or is it safe?