Timer and Counter Instructions
Chapter 5
516
Table 5.B
Timer Instructions
NOTE:
The Timer word address, XXX, is assigned to the timer Accumulated areas of the Data Table. To determine which addresses are valid
accumulated areas, the 3rd digit from the right in the word address must be even.
The time base, TB, is userselectable and can be 1.0 sec., 0.1 sec., or 0.01 sec. Preset values, YYY, and Accumulated values, ZZZ, can vary from
000 to 999.
The word address displayed will be 3, 4, or 5 digits long depending on the Data Table size. When entering the word address, use a leading zero if
necessary.
Keytop Symbol
Instruction Name
1770T3 Display
Description
-(TON)-
TIMER ON DELAY
XXX
-(TON)-
TB
PR YYY
AC ZZZ
When the rung is TRUE, the timer begins to increment the
Accumulated Value at a rate specified by the time base.
When the rung is FALSE, the timer resets the Accumulated
Value to 000. See Note.
-(TOF)-
TIMER OFF DELAY
XXX
-(TOF)-
TB
PR YYY
AC ZZZ
When the rung is FALSE, the timer begins to increment the
Accumulated Value.
When the rung is TRUE, the timer resets the Accumulated
Value to 000. See Note.
-(RTO)-
RETENTIVE TIMER
XXX
-(RTO)-
TB
PR YYY
AC ZZZ
When teh rung is TRUE, the timer begins to increment the
Accumulated value. When FALSE, the Accumulated value
is retained.
It is reset only by the RTR instruction. See Note.
-(RTR)-
RETENTIVE TIMER
RESET
XXX
-(RTR)-
PR YYY
AC ZZZ
XXX - Word address of the retentive timer it is resetting.
YYY - Preset Value automatically entered by the Industrial
Terminal.
ZZZ - Accumulated Value automatically entered by the
Industrial Terminal.
When the rung is TRUE, the Accumulated Value and
status bit are reset to zero. See Note.
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