Examples of network variable bindings
CNT-SVX09B-EN 21
Example 2: Display sensor readings from a Tracer
MP503 on two different Tracer MP581 operator displays
This example builds on example 1 and shows that bindings can be “one to
many.” In this example, a second Tracer MP581 is added to the system
described in example 1. The second Tracer MP581 also controls an AHU.
This AHU also requires the outside air enthalpy in order to control its
economizer. As in example 1, use bindings to allow the economizer control
in the second Tracer MP581 to calculate outside air enthalpy.
Figure 7 shows the LonTalk network for this example.
Figure 7. LonTalk network for example 2
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 second Tracer MP581. The Rover service tool shows you only the vari-
ables in Tracer MP581 #2 of the SNVT that matches the variable you
selected in the Tracer MP503.
Table 4 shows the bindings needed between the Tracer MP503 and Tracer
MP581 #2.
Again, after you have completed the bindings, you need to program
Tracer MP581 #2 to calculate enthalpy from the outside air temperature
Table 4. Bindings for example 2
Network variable output on
the Tracer MP503
Network variable input on
Tracer MP581 #2
nvoTemperature1 binds to
nviTemp01
1
nvoCurrent2 binds to
nviCurrent_mA01
2
1
The Tracer MP581 has 40 generic temperature (SNVT_temp_p) network variable
inputs available for binding (nviTemp01 through nviTemp40).
2
The Tracer MP581 has 8 generic current (SNVT_amp_mil) network variable inputs
available for binding (nviCurrent_mA01 through nviCurrent_mA08).
®
LonTalk link
Tracer MP503
Tracer MP581 #1
with operator display
Tracer MP581 #2
with operator display
Additional
LonTalk
devices
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