Tracer Mp580/581 Bindings; Receiving Data; Sending Data; Heartbeated Network Variables - Trane Engineered Smoke Control System Application Manual

Chapter 8 Network variable bindings
Table 29. Tracer MP580/581 generic network variable inputs
Variable name
nviSwitch01 ...
nviSwitch40
nviPercent01 ... SNVT_lev_percent
nviPercent20
Table 30. Tracer MP580/581 generic network variable outputs
Variable name
nvoSwitch01 ...
nvoSwitch40
nvoPercent01 ... SNVT_lev_percent
nvoPercent20
122

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.
SNVT Data type
SNVT_switch Binary
Analog

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.
SNVT Data type
SNVT_switch Binary
Analog

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.
Description
Bind to these 40 network variable inputs to communi-
cate binary values to the device.
Bind to these 20 network variable inputs to communi-
cate levels in percent to the device. The valid range is
from –163.84% to 163.83% with a resolution of 0.005%.
Description
These 40 network variable outputs communicate binary
values to other devices.
These 20 network variable outputs communicate levels
in percent to other devices. The valid range is from –
163.84% to 163.83% with a resolution of 0.005%.
BAS-APG001-EN