AH500 Programming Manual Symbol: PLF D ： Specified device Bit Explanation: 1. When the conditional contact is switched from ON to OFF, the instruction PLF is executed, and the device D sends out a pulse for a scan cycle. 2. Please do not use the instruction PLS in the function block. Example: When X0.0 is ON, M0 is ON for a pulse time. When M0 is ON, Y0.0 is set to ON. Timing chart: X0.0 One scan cycle M0 Y0.0 5-18 Instruction code Operand Function PLF D Falling-edge output Device DX DY X Y M SM S T C HC D L PR D ● ● ● ● ● ● ● ● ● ● ● ●