PLC no operation (NOP), program end (END) command

1. no operation (NOP)
NOP: no operation

NOP instruction is typically used for the following aspects: Specifies a certain sequence content is empty, blank for use; some short circuit the contacts or circuit, as shown in Figure 7.24 (a), (b) shown cut off some of the circuit, as shown in Figure 7.24 (c), (d) shown in transform previous circuit, as shown in Figure 7.24 (e) as shown.
2. the procedure ends (END) command
END: end of instructions of a program