RS Automation X8 Series, Instruction Manual

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X8 Instruction Set Reference Manual
8-2 Timer and Counter Instructions
Timers and counters are output instructions that let you control operations
based on time. The following Timer and Counter Instructions are described in
this chapter:
Timer Instructions
Overview
To use timer, the TM instruction for timer data table must be used and is used
to configure and monitoring.
Timer data table has three sub-elements for timer controlling. These
sub-elements are:
• Timer Control and Status
• Preset
This is the value that the timer must reach before the timer times out. When the
accumulator reaches this value, the DONE status bit is set.
• Accumulator
This is the timer value that currently accumulated. It represents elapsed time.
The accumulator data range is from 0 to 32767.
Timers can be set to any one of three time bases.
The TimeBase 0 and TimeBase1 value in the table above is automatically set in
the ladder program. If the BASE value in the figure below is set to 0.001, the
TimeBase 0 and TimeBase1value in the TM data table related with the BASE
value is set automatically.
Instruction Description
TON Timer ON
TOF Timer OFF
TONR Retentive Timer
CTU Count up
CTD Count down
RSTA Accumulator Initialization (Reset)
Timer Base Settings
Time Base Timing Range Data Table Settings
TimeBase1 TimeBase0
0.001 seconds 0 ~ 32.767 seconds 0 1
0.01 seconds 0 ~ 327.67 seconds 0 0
1.00 seconds 0 ~ 32,767 seconds 1 0