While it is running in the forward direction, O:2/15 coil2 remains de-energized and reverse action is not
activated. TOF is used here so input to T4:0 is true hence timer is not activated.
When I:1/1 is pressed, O:2/14 coil1 energizes making coil2 O:2/15 de-energized.
When O:2/15 is de-energized, input to timer T4:1 goes true from false and input to T4:0 goes false from true.
Since TOF is used, when input goes true to false, T4:0 is activated. XIO of T4:0/DN is given to Reverse
Coils (O:2/2 and O:2/3) are not energized until timer count is completed. Completion of time delay sets Done bit
to low energizing Reversing Coils (O:2/2 and O:2/3).
Similar operation happens when motor is running in the reverse direction and forward direction input is
given.
Runtime Test Cases
Simulation of this problem was successfully performed in software LogixPro of Allen Bradley and verified
using I/O Simulator.
Instead of actual
contactors or motor outputs, simple LED outputs were used to perform this in I/O
Simulator.
PLC Program to Drive Motors Simultaneously with Interlocking
This is a PLC Program to Drive Motors Simultaneously with Interlocking.
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