Timer Off Delay With Reset (Tofr); Structured Text; Function Block Operands; Fbd_Timer Structure - Allen-Bradley Logix5000 Reference Manual

Timer Off Delay with Reset
(TOFR)
TOFR(TOFR_tag);
Input Parameter Data Type
EnableIn BOOL
TimerEnable BOOL
PRE DINT
Reset BOOL
Output Parameter Data Type
EnableOut BOOL
ACC BOOL
EN BOOL
TT BOOL
DN BOOL
Timer and Counter Instructions (TON, TOF, RTO, TONR, TOFR, RTOR, CTU, CTD, CTUD, RES)
The TOFR instruction is a non-retentive timer that accumulates time when
TimerEnable is cleared. This instruction is available in relay ladder as two
separate instructions:
· TOF (See
· RES (See
Operands:

Structured Text

Variable
TOFR tag

Function Block Operands

Operand
TOFR tag

FBD_TIMER Structure

Description
Function Block
If cleared, the instruction does not execute and outputs are not updated.
If set, the instruction executes.
Default is set.
Structured Text
No effect. The instruction executes.
If cleared, this enables the timer to run and accumulate time.
Default is cleared.
Timer preset value. This is the value in 1ms units that ACC must reach before timing is finished. If
invalid, the instructions sets the appropriate bit in Status and the timer does not execute.
Valid = 0 to maximum positive integer
Request to reset the timer. When set, the timer resets.
Default is cleared.
Description
The instruction produced a valid result.
Accumulated time in milliseconds.
Timer enabled output. Indicates the timer instruction is enabled.
Timer timing output. When set, a timing operation is in progress.
Timing done output. Indicates when accumulated time is greater than or equal to preset.
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
page 116).
page 153).
Type
FBD_TIMER
Type
FBD_TIMER
Format Description
Structure TOFR structure
Format Description
Structure TOFR structure
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