Chapter 11 Function Block Diagram If the users want to cancel the inverse logic, they can click again. 11.2.5 Rising and Falling edge-triggered Input In a function block diagram in ISPSoft, the mark P on an input node indicates that the input node is rising edge-triggered, and the mark F on an input node indicates that the input node is falling edge-triggered. The mark P/F can only be inserted into an input node which represents a Boolean device or a symbol whose data type is BOOL, or an input node of an AND/OR block. Users are not allowed to insert P/F into the operands of a function block/an applied instruction, and the En pin of a function block/an applied instruction.
Graphical representation Example Example 1: When M0 is turned from OFF to ON, M1 is ON. When M0 is turned form ON to OFF, M1 is OFF. Example 2: The mark F is inserted into an input pin of the AND block. 11-17 P /F