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Chapter 8
Network variable bindings
Overview
The LonTalk communications protocol allows data to be shared between
devices (stand-alone or with a BAS) on a LonTalk network. This is called
peer-to-peer communication. As an example of peer-to-peer communica-
tion, two or more devices serving the same space share data, such as a
temperature reading, without having to pass the data through a BAS.
Network variables are used to share data between devices. The method
used to direct data from one device to another is called network variable
binding, or just binding. A network variable output from one device is
bound to a network variable input on another device. An output variable
from one device can be bound to input variables on many other devices.
Binding network variables
Each network variable is a standard type. This standard type is referred
to as a standard network variable type (SNVT). To bind two variables
together they must be the same SNVT. For example, an output of type
SNVT_temp_p can only be bound to an input of type SNVT_temp_p. For
more information about SNVTs, see the LonMark™ Web site (www.lon-
mark.org). From that Web site you can download the official list of
SNVTs.
IMPORTANT
Only LonTalk devices can use network variable binding. Devices on
other communications links do not have this capability.
BAS communications typically do not require the use of network variable
binding because a Tracer Summit BCU will automatically bind to the
proper data in a device. However, communications speed may be
increased between two devices by binding their data rather than having
the BAS read the information from one device and then broadcast it to
another.
Use the Rover service tool to create bindings. (See the
Rover Operation
and Programming
guide, EMTX-SVX01E-EN.)
Содержание Engineered Smoke Control System
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Страница 3: ...BAS APG001 EN September 2006 Applications Guide Engineered Smoke Control System for TRACER SUMMIT ...
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Страница 12: ...Contents vi BAS APG001 EN ...
Страница 30: ...Chapter 1 Smoke control overview 18 BAS APG001 EN ...
Страница 48: ...Chapter 3 Installation diagrams 36 BAS APG001 EN Figure 14 Tracer MP581 to FSCS wiring ...
Страница 50: ...Chapter 3 Installation diagrams 38 BAS APG001 EN Figure 15 Tracer MP581 to FACP wiring ...
Страница 57: ...Wiring high voltage ac power BAS APG001 EN 45 Figure 19 AC wiring ...
Страница 59: ...EMI RFI considerations BAS APG001 EN 47 Figure 20 Checking the earth ground ...
Страница 75: ...EMI RFI considerations BAS APG001 EN 63 Figure 31 Checking the earth ground ...
Страница 96: ...Chapter 5 Installing the Tracer MP581 programmable controller 84 BAS APG001 EN ...
Страница 104: ...Chapter 6 Installing the EX2 expansion module 92 BAS APG001 EN Figure 49 I O bus wiring example 2 ...
Страница 110: ...Chapter 6 Installing the EX2 expansion module 98 BAS APG001 EN ...
Страница 123: ...End process verification BAS APG001 EN 111 Figure 61 ast actuator fail checkb 3 13 06 ...
Страница 132: ...Chapter 7 Programming 120 BAS APG001 EN ...
Страница 151: ...Understanding bindings BAS APG001 EN 139 Figure 79 Mixed subnet node and group bindings ...
Страница 152: ...Chapter 8 Network variable bindings 140 BAS APG001 EN ...
Страница 154: ...Appendix A References 142 BAS APG001 EN ...
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