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Section 5 – Recorder Setup
Page 44 09/11/2008 REV 0.99
Figure 5-9 Gated Timer Setup
5.1.3.6 Conditional Input
Any of the eighteen channels can be a
conditional channel. A conditional channel gets
its value from a true or false test of conditions
which may be based on a live channel. Setting
a live input channel to be a conditional channel
will disable the live input. It is recommended
that the virtual channels (Channel 7 to 18 in a 6
input unit or Channels 13 to 18 in a 12 channel
unit) be assigned as conditional channels.
Basically the user sets up a condition which
can have two possible outcomes, one if the
condition is true and another if the condition is
false.
The Conditional Channel Setup dialog window
requires three inputs: the condition to be
tested, the result if true, and the result if false.
See Figure 5-8.
C01 through C18 represent channels 1 to 18, some of which may be live channels. The Conditional
Channel Setup window also allows up to six constants to be set and used. See constants above.
Once data has been entered, the expression needs to be tested as shown above before exiting by
pressing the Exit button. In the example of Figure 5-8, Channel 13 is being programmed to indicate zero
to 100 for a 4 – 20 milliamp input on Channel 1 with any input less than 4 milliamps showing zero.
5.1.3.7 Gated Timer
The Gated timer Calculated point type allows a
timer (measuring in seconds) to be controlled by a
„gate‟ from a logic point. For example, if a point is
measuring temperature and you wanted to know
the total amount of time the temperature measured
by this point is above or below a certain level, a
Conditional point can be programmed to be TRUE
only when the temperature is above or below a set
level. A Gated timer point can then be programmed
to be turned ON only when the Conditional point is
in the TRUE state. The Gated timer point will then
only be timing when the temperature is above or
below a set level. The timer will continue to
accumulate time (in seconds) each time it is turned
on. The Gated timer point can be reset at
programmable time intervals and alarms can be
set to alarm if the timer total goes above a
programmed time interval in seconds.
The Gated Timer Setup dialog window is shown in above right. There are several options:
Auto Reset: If this box is unchecked the Timer will run continuously unless External Reset is enabled. If
the Auto Reset box is checked then the timer will reset at the reset interval.
Figure 5-8 Conditional Channel Setup