Trane Tracer MP581 User Manual

Chapter 10 Network variable bindings
118 CNT-SVP01C-EN
Examples of network variable bindings
The following examples show four common uses of bindings in Tracer
MP580/581 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
input/output (I/O) module. A thermistor reading the outside air tempera-
ture is connected to universal 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 Trou-
ble) are connected to universal input 3 and universal input 4, respectively.
A Tracer MP581 controller is on the same Comm5 link as the Tracer
MP503. The Tracer MP581 is controlling an air-handling unit (AHU). The
outside air enthalpy is required to control 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 76 on
page 119 shows the Comm5 network for this example.
nvoDischAirTemp SNVT_temp_p Analog This network variable output communicates the dis-
charge air temperature in degrees Celsius to other
devices. The valid range is from –273.17°C to 327.66°C
with a resolution of 0.01°C.
nvoSpaceRH SNVT_lev_percent Analog This network variable output communicates the space
relative humidity in percent to the devices. The valid
range is from –163.84% to 163.83% with a resolution of
0.005%.
nvoSpaceCO2 SNVT_ppm Analog This network variable output communicates the space
concentration of carbon dioxide (CO
2
) in parts-per-million
to other devices. The valid range is from 0 ppm to
65,535 ppm with a resolution of 1 ppm.
nvoMATemp SNVT_temp_p Analog This network variable output communicates the mixed
air temperature in degrees Celsius to other devices. The
valid range is from –273.17°C to 327.66°C with a resolu-
tion of 0.01°C.
Table 13. Tracer MP580/581 SCC profile network variable outputs (Continued)
Variable name SNVT Data type Description
* The variable nvoUnitStatus contains structures. It cannot be viewed on the operator display.
Note: For more information on network variable outputs associated with the SCC profile, see the LonMark™ Functional Profile:
Space Comfort Controller. For more information on any standard network variable types (SNVTs), see SNVTs and SCPTs in the
Device Resource Files on the LonMark™ Web site at www.lonmark.org.

Trane Tracer MP581 Specifications

General

Brand	Trane
Model	Tracer MP581
Category	Controller
Language	English