PM3/PM6 LEGACY™ Express PID Controller • 6 • Specifications
(Overview Continued)
Internal Functions
The controller will use input signals to calculate
a value and then perform an operation. A sam-
ple of some functions may be as simple as:
• Detect a failure of the primary sensing device
and trip a contactor to remove power from the
heating element.
• Reading a digital input to set a state to true
or false.
• Evaluate an incoming temperature to deter-
mine an alarm state (on or off).
• Compare an input value to the set point and
calculate the optimal power for a heater.
To set up a function, it’s important to define
the source, or instance, to use. For example, if
the control is equipped with DIO they can be
configured to respond to an alarm. If config-
ured as such, the digital output must be tied
to the desired alarm instance (1 to 4). Using
this as an example, the Function for the digital
output would be defined as an Alarm where
the Instance would be selected as 1, 2, 3, or 4
corresponding to the alarm instance that will
drive the output.
Keep in mind that a function is a user-
programmed internal process that does not
execute any action outside of the controller.
To have any effect outside of the controller,
an output must be configured to respond to
a function.
Outputs
The Output Wire Terminals are located on
the back side of the controller. See Figure 3.
The Outputs properly wired and configured
can perform various functions or actions in
response to information provided by a function
such as, removal of the control voltage to a
contactor; operating a heater, turning a light on
or off, unlocking a door, etc.
Assign a Function to any available output on
the Setup Page within the Output Menu or
Digital Input/Output Menu. Then select which
instance of that function will drive the selected
output. For example, you might assign an
output to respond to alarm 4 (instance 4).
You can assign more than one output to
respond to a single instance of a function. For
example, alarm 2 could be used to trigger a
light connected to output 1 and a siren con-
nected to digital output 5.
Figure 3: Output Wiring Example
