Examples of network variable bindings
CNT-SVX09B-EN 19
Examples of network variable bindings
The following examples show four common uses of bindings in Tracer
MP503 applications.
Example 1: Display sensor readings from a Tracer
MP503 on a Tracer MP581 operator display
In this example, four different sensors are connected to a Tracer MP503.
A thermistor reading the outside air temperature is connected to univer-
sal input 1 on the Tracer MP503. A 4–20 mA sensor reading the outside
air humidity is connected to universal input 2. Two binary inputs from a
fire panel (Alarm Status and Fire Panel Trouble) are connected to univer-
sal input 3 and universal input 4, respectively. A Tracer MP581 is on the
same LonTalk link as the Tracer MP503. The Tracer MP581 is controlling
an air-handling unit (AHU). The outside air enthalpy is required to con-
trol the economizer on the AHU.
The building operator also wants to know the outside air temperature
and humidity, so those values should be displayed on the operator display
of the Tracer MP581. The location of the outside air sensors made it con-
venient to wire those points to the Tracer MP503 also.
Use bindings to allow the economizer control in the Tracer MP581 to cal-
culate outside air enthalpy and to display the four inputs from the Tracer
MP503 on the operator display of the Tracer MP581. Figure 6 shows the
LonTalk network for this example.
Figure 6. LonTalk network for example 1
Use the Rover service tool to create bindings. (See the Rover Operation
and Programming guide, EMTX-SVX01B-EN.) Using the Rover service
tool, select the network variable from the Tracer MP503 and then select
the Tracer MP581. The Rover service tool shows you only the variables in
the Tracer MP581 of the SNVT that matches the variable you selected in
the Tracer MP503.
®
LonTalk link
Tracer MP503
Tracer MP581 with
operator display
Additional
LonTalk
devices
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