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request will respond with an I-Am response, informing the client of what network
address its device instance is associated with. By default, the gateway will use
dynamic device binding if a service object is not configured to use static device
binding.
Static Device Binding
(MS/TP only) Not all BACnet devices support dynamic device binding. If the
gateway needs to request data from an MS/TP slave, or an MS/TP master that
doesn’t support dynamic device binding, then static device binding must be used.
Static device binding allows the user to manually define the information that the
client would normally acquire using dynamic device binding. The only additional
information the user must define is the network address of the destination device.
This feature may also be useful if the destination device instance is unknown, but
the network address of the device is known. In this case, an arbitrary device
instance may be used (as long as it does not conflict with any other device
instances in other defined service objects) and the destination address must be
set to the network address of the device.
11.3.2.4
BACnet Object Mapping
Analog Objects
Analog objects are mapped in the database as either an 8-bit, 16-bit, or 32-bit
value, depending on the data type selected. This means that each analog object
in a service object consumes one, two, or four database addresses, respectively.
For example, if a service object’s starting analog output instance is “1”, the
number of instances is “5”, the database address is “100”, and the data type is
“32-bit Unsigned”, then AO 1 through 5 will be mapped at database addresses
100 through 119 (AO 1 is mapped at address 100 through 103, AO 2 is mapped
at address 104 and 107, and so on).
Binary Objects
Binary objects are mapped on a bit-by-bit basis in the database starting with the
least significant bit of the database byte. For example, if a service object’s
starting binary output instance is “1”, the number of instances is “12”, and the
database address is “240”, then BO 1 through 8 will be mapped to bit 0 through
7, respectively, at address 240, and BO 9 through 12 will be mapped to bit 0
through 3, respectively, at address 241. The remaining 4 bits in the byte at
address 241 are unused.
Содержание ETH-1000
Страница 44: ...43 ICC 8 7 4 BBMD Currently the BBMD is only configurable via the embedded web page Refer to section 10 11...
Страница 60: ...59 ICC Figure 10 MELSEC Client Concept...
Страница 158: ...157 ICC Figure 22 Core FTP in Connected State...
Страница 208: ...207 ICC SMin SMax Min Max multiplier Equation 1 SMin offset Equation 2...
Страница 278: ...277 ICC Figure 114 BACnet Modbus Binary Objects Discretes Big Endian...