Rievtech PR-12 Series, User Manual And Programmers Manual

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6.1.4 Rising edge and falling edge
Input / output
Operand
Data type
Input
（
FBD
）
I, Q, M, SM, T, C, V, S, L, Enable bit Boolean
output
（
FBD
）
I, Q, M, SM, T, C, V, S, L, Enable bit Boolean
When left logic is converted from 0 to 1,Rising edge contact
conduction time is a scan cycle.
When left logic is converted from 1 to 0,Falling edge contact
conduction time is a scan cycle.
In LAD, the rising edge and the falling edge are represented
by the contacts.
Example: