Chapter 8 Network variable bindings

Tracer MP580/581 bindings

This section discusses which network variables will be necessary to achieve UUKL time performance requirements. Only “generic” network variables, which are neither Space Comfort Controller (SCC) or Discharge Air Controller (DAC), are necessary. Use of generic variables does not affect either BCU auto-bound network variables or SCC or DAC based network variables.

Receiving data

A network variable input (nvi) receives data from other devices on the LonTalk network. The generic network variable inputs, nviSwitch and nviPercent, that are commonly used in Tracer MP580/581 bindings are shown in Table 29.

Table 29. Tracer MP580/581 generic network variable inputs

Variable name

SNVT

Data type

Description

 

 

 

 

nviSwitch01 …

SNVT_switch

Binary

Bind to these 40 network variable inputs to communi-

nviSwitch40

 

 

cate binary values to the device.

 

 

 

 

nviPercent01 …

SNVT_lev_percent

Analog

Bind to these 20 network variable inputs to communi-

nviPercent20

 

 

cate levels in percent to the device. The valid range is

 

 

 

from –163.84% to 163.83% with a resolution of 0.005%.

 

 

 

 

Sending data

A network variable output (nvo) sends data to other devices on the Lon- Talk network. The generic network variable outputs, nvoSwitch and nvo- Percent, that are commonly used in Tracer MP580/581 bindings are shown in Table 30.

Table 30. Tracer MP580/581 generic network variable outputs

Variable name

SNVT

Data type

Description

 

 

 

 

nvoSwitch01 …

SNVT_switch

Binary

These 40 network variable outputs communicate binary

nvoSwitch40

 

 

values to other devices.

 

 

 

 

nvoPercent01 …

SNVT_lev_percent

Analog

These 20 network variable outputs communicate levels

nvoPercent20

 

 

in percent to other devices. The valid range is from –

 

 

 

163.84% to 163.83% with a resolution of 0.005%.

 

 

 

 

Heartbeated network variables

All necessary information can be sent using nvoSwitch (SNVT_switch) and nvoPercent (SNVT_lev_percent), which are “heartbeated” variables. All necessary information can be received using nviSwitch (SNVT_switch) and nviPercent (SNVT_lev_percent). Heartbeated variables are a means of indicating freshness of information and/or quality of the communication link. For more information regarding heartbeating, see “Understanding bindings” on page 130.

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BAS-APG001-EN

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Trane BAS-APG001-EN manual Tracer MP580/581 bindings, Receiving data, Sending data, Heartbeated network variables
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