Installation manual
CNC 8055
CNC 8055i
PLC RESOURCES
9.
SOFT: V02.2X
·439·
Timers
Reset input (TRS)
This input allows the timer to be initialized, by assigning the value 0 to its T status and by canceling
its count (it initializes this to 0). It is referred to by the letters TRS followed by the timer number it
is wished to reference, for example TRS 1, TRS 25, TRS 102, etc.
This initialization of the timer will be made when a transition of logic level from "0" to "1" (leading
edge) is produced. By default, every time a timer is activated, the PLC sets this input low ("0").
If, once the timer is activated, a leading edge is produced at the TRS input, the PLC initializes the
timer, assigning value 0 to its T status and cancelling the count (it initializes this to 0). The timer is
deactivated and its trigger input must be activated to turn the timer back on.
Example:
I3 = TRS 10 Input I3 controls the Reset input of timer T10.
Trigger input (TG1, TG2, TG3, TG4)
These inputs allow the timer to be activated, and it begins to time. They are referred to by the letters
TG1, TG2, TG3, TG4 and followed by a timer number and the initial timing value (time constant).
For example TG1 1 100, TG2 25 224, TG3 102 0, TG4 200 500, etc.
The time constant value is defined in thousandths of a second, and it is possible to indicate this by
means of a numerical value or by assigning it the internal value of an R register.
TG1 20 100 Activates timer T20 by means of trigger input TG1 and with a time constant
of 100 milliseconds.
TG2 22 R200 Activates timer T22 by means of trigger input TG2 and with a time constant
which will be defined (in thousandths of a second) by the value of Register
R200 when the instruction is executed.
Inputs TG1, TG2, TG3 and TG4 are used to activate the timer in four different operating modes:
• TG1 input in MONOSTABLE mode
• TG2 input in DELAYED CONNECTION mode
• TG3 input in DELAYED DISCONNECTION mode
• TG4 input in SIGNAL LIMITING mode
This activation of the timer is made when a logic level transition of any of these inputs is produced,
either from "0" to "1" or from "1" to "0" (leading or trailing edge) depending on the chosen input. By
default and every time the timer is initialized by means of the reset input (TRS), the PLC will assign
logic level "0" to these inputs.
The operating mode of each of these trigger inputs is explained individually.
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