Incazelo emfushane:

1. Ithuluzi lokulawula ukuxhuma ikhava yethangi: lapho umzimba wethangi ungena, ikhava yethangi izokwabiwa ngokufanele.Uma lingekho ithangi, ngeke libe nesivalo.

2, idizayini yephaneli yokusebenza ye-PLC inengqondo futhi ilula, kulula ukuyilungisa nokuyigcina;