Display; Example 2: Display Sensor Readings From A Mp503 On Two Different Mp581 Operator Displays - Trane Tracer MP503 Installation, Operation And Maintenance Manual

and then select the MP581. The Rover service tool shows only the variables in the MP581 for the
SNVT that matches the variable selected in the MP503 (refer to
Table 3.
(a) The MP581 has 40 generic temperature (SNVT_temp_p) network variable inputs available for binding (nviTemp01 through
(b) The MP581 has 8 generic current (SNVT_amp_mil) network variable inputs available for binding (nviCurrent_mA01 through
(c) The MP581 has 40 generic binary (SNVT_switch) network variable inputs available for binding (nviSwitch01 through nviS-
After completing the bindings, program the MP581 to display this data on the operator display.
Important:
Example 2: Display Sensor Readings from a MP503 on Two Different MP581 Operator
Displays
This example builds on example 1 and shows that bindings can be one-to-many. In this example,
a second MP581 is added to the system as described in example 1. The second MP581 also controls
an AHU. This AHU 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 MP581 to calculate outside
air enthalpy.
Figure 7.
Use the Rover service tool to create bindings. (Refer to the Rover Operation and Programming
Guide (EMTX-SVX01). Using the Rover service tool, select the network variable from the MP503
and then select the second MP581. The Rover service tool shows only the variables in MP581 #2
CNT-SVX09E-EN
Bindings for example 1
Network Variable Output on the
MP503
nvoTemperature1
nvoCurrent2
nvoBIP3Status
nvoBIP4Status
nviTemp40).
nviCurrent_mA08).
witch40).
Remember that the outside air humidity is being transmitted over the network in
units of mA. Some custom programming is required in the MP581 to convert the
humidity from units of mA to units of percent (%). Custom programming in the
MP581 also uses the outside air temperature and humidity to calculate the outside
air enthalpy and use it to control the economizer of the AHU.
Figure 7 shows the LonTalk network for this example.
LonTalk network for example 2
Tracer MP581 #1
with operator display
LonTalk link
Binding To




Tracer MP581 #2
with operator display
Tracer MP503
®
Network Variable Bindings
Table 3.
Network Variable Input on the
MP581
(a)
nviTemp01
(b)
nviCurrent_mA01
(c)
nviSwitch01
nviSwitch01
(c)
Additional
LonTalk
devices
17