Instruction Manual

Appendix C: Ladder Diagram Block Reference Pointe Controller User Guide
352
Configuration Reference
The parameters of this block are described in the following table:
Param Name Config Var Type Description
IN Input
State
no - The state of the rung (off/on)
received from the left.
Q Output
State
no - The state of the rung (off/on)
passed to the right.
TIMER Timer req Timer The Timer variable on which the
function is based.
PT Preset
Time
opt %IUD
%QUD
%MUD
Numeric
The length of the delay, in msecs. If
no Preset Time is defined, then the
preset value of Timer variable is
used.
ET Elapsed
Time
opt %QUD
%MUD
The time elapsed since the Input
State became on, in msecs. In most
instances, the Elapsed Time equals
the current value of the Timer
variable.
C.2.3 Timer, OFF Delay (TOF)
When used in a Ladder Diagram, the TOF block turns off the output state after a
specified time delay has elapsed.
Select the
tool (from the Timers and Counters Blocks toolbar) and click on a
ladder rung to insert the following block:
Once the block is inserted, you can double-click on it to configure it.
Functional Description
When the Input State (IN) becomes on, the Output State (Q) is turned on and the
associated Timer variable (TIMER) is reset to 0.
When IN becomes off, the Timer is started and continues while IN remains off.
When the Timer equals the Preset Time input (PT), Q is turned off.
If IN becomes on while the Timer is counting but before it equals PT, then the
Timer is reset to 0 and Q remains on.