Chapter 4 Basic Instructions PLF is a falling-edge output instruction. When X0.0 is turned from ON to OFF, the instruction PLF is executed. MO sends a pulse for a scan cycle. Explanation Ladder diagram Instruction code: Description: Example X0.0 M0 PLF M0 Loading the Form A contact X0.0 LD X0.0 Loading the Form A contact M0 Timing diagram: LD M0 X0.0 SET Y0.0 Y0.0 remains ON. M0 One scan cycle Y0.0 A pointer indicates a subroutine. It is in the range of P0 to P255. A pointer can be used by API 00 CJ, API 01 CALL, API 256 CJN, and API 257 JMP. The pointers used do not have to start from P0. A pointer number can not be used repeatedly, otherwise an unexpected error will occur.
Explanation Ladder diagram Instruction code: Description: Example LD X0.0 Loading the Form A contact X0.0 The jump instruction CJ specifies P10. : CJ P10 LD X0.1 Loading the Form A contact X0.0 OUT Y0.1 Driving the coil Y0.1 4-15 Instruction code Operand Function PLF S Falling-edge output Device Xn.n Yn.n M S K 16# F KnM KnS D W T C V Z S 0 SET Y0.0 PLF M0 M0 is falling edge-triggered. Instruction code Operand Function P – Pointer CJ P10 P10 X0.1 Y0.1 CJ P10 P10 Pointer P10