Delay in turning on two different start buttons in Star/Delta starter on PLC
ErrBim is an error if there is no signal from motor protection switch (Bimetal NC), when set it has to be cleared by an acknowledge signal (Proc.ErrClearPulse)
StartBtn is a start button NO, that is evaluated with positive change, when it switches from 0-&gt;1
StopBtn is a stop button NC
ESTOP is the emergency stop signal NC, if not present it stops all
S_ON is a intermediate flag
K_ON is the output for the main contactor
InterlockT is a timer that prevents a quick re-start, Off Delay
StarT is a timer for star/delta changeover, On Delay
K_Star is an output for star contactor
K_Delta is an output fro delta contactor

EDIT:
It could be also in one single network, depends on your engineering software. If you need fwd/bkw is almost the same, except you do split into two sections, then you OR the InterlockT with fwd OR bkw contactor output.