Instruction manual

Introduction
20
890USE18300 September 2003
Timer Action
Types
Timer blocks support four action types:
delay-to-start timers
delay-to-stop timers
rising-edge timers
falling-edge timers
Timer blocks respond to a digital trigger input. A block begins accumulating time
units on either the rising edge or falling edge of the trigger input and accumulates
counts until it reaches a user-specified terminal count.
For a rising- or falling-edge timer, the accumulator holds the terminal count until the
rising or falling edge of the trigger starts a new counting operation or until the block
receives a reset input:
rising-edge timer
falling-edge timer
trigger
timer
0
0
1
0
1
output
TC
0
1
reset
trigger
timer
0
0
0
1
output
TC
0
1
reset