Preface
MicroLogix 1000 Programmable Controllers User Manual
6–2
Timer/Counter Instructions
Instruction
Purpose
Page
Mnemonic
Name
Purpose
Page
TON
Timer On-Delay
Counts timebase intervals when the instruction is
true.
6–11
TOF
Timer Off-Delay
Counts timebase intervals when the instruction is
false.
6–12
RTO
Retentive Timer
Counts timebase intervals when the instruction is
true and retains the accumulated value when the
instruction goes false or when power cycle occurs.
6–14
CTU
Count Up
Increments the accumulated value at each false-to-
true transition and retains the accumulated value
when the instruction goes false or when power cycle
occurs.
6–18
CTD
Count Down
Decrements the accumulate value at each false-to-
true transition and retains the accumulated value
when the instruction goes false or when power cycle
occurs.
6–19
RES
Reset
Resets the accumulated value and status bits of a
timer or counter. Do not use with TOF timers.
6–20
About the Basic Instructions
These instructions, when used in ladder programs represent hardwired logic circuits
used for the control of a machine or equipment.
The basic instructions are separated into three groups: bit, timer, and counter.
Before you learn about the instructions in each of these groups, we suggest that you
read the overview that precedes the group:
•
Bit Instructions Overview
•
Timer Instructions Overview
•
Counter Instructions Overview
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