The Or function block is used to perform a logical OR function on a number of discrete inputs. You can use the Or block to trigger events based on equipment status.
Application example: equipment shutdown
Assume a downstream conveyor must be shut down when one of the upstream conveyors stops. The following figure shows an example conveyor system:
Figure: Or function block application example
You configure the Or function block to stop Conveyor 3 when the inputs from Conveyor 1 or Conveyor 2 indicate a shutdown. The following figure is the function block diagram for this example:
Figure: Or function block diagram example
