User`s guide

Function Blocks
Function Block Categories and Types
72 UMC800 Control Builder User’s Guide Release E
1/01
Counters/timers group category
Table 20 lists the function block types in the Counter/Timers category.
Table 20 Counters/timers category function block types
Block Type Description Graphic Form
RTMR Resettable Timer - Provides increasing or decreasing timing
base on an enable input.
Increasing time from 0 or preload value. Provides digital
output upon reaching Preset
Decreasing time from preset or preload value. Provides digital
output upon reaching zero.
Preset range of 0–99999.9 seconds with output update
dependent on analog scan rate.
PTMR Periodic Timer - Provides a digital high (one) output for one
controller scan cycle based on a specified time period. Or
time of day referenced to real-time clock.
UPDN Up/Down Counter - Count the number of raising edge logic
transactions on the input to the block up to a preset value
(RPRE or LPRE). When the preset value is reached, a logic
output is enabled. A Reset input (RST) resets the block.
Value may be set to increase to the preset value or decrease
from the preset value of up to 99999 counts.
OFDT
Off Delay Timer - Provides an OFF state logic output
delayed by a user specified delay time after an ON to OFF
transition of the RST input. (This block also appears in the
Fast Logic group.)
Delay time is up to 9999.9 seconds
ONDT On Delay Timer - Provides an On state logic output delayed
by a user specified delay time after an OFF to ON transition
of the RUN input. (This block also appears in the Fast Logic
group.)
Delay time is up to 9999.9 seconds