PROGRAMMING METHOD IN PLC

摘要

PPROBLEM TO BE SOLVED: To make a specific program section in a user program inoperable in any PLC other than specific PLC on one hand, and to make the other program section operable in any PLC. PSOLUTION: The prescribed address of an input/output memory in which hardware unique data appear is set to the first operand of a general comparison instruction, and the hardware unique data of a PLC in which a protection object program section should be operated is set to a second operand, and the projection object program section is made executable by using the execution result of the general comparison instruction as input conditions, and the whole program section is replaced with a function block for display protection. PCOPYRIGHT: (C)2009,JPO&INPIT