Specifications

Analog Output Modules
272
31007715 6/2008
STB AVO 1255 Data for the Process Image
Representing
the Analog
Output Data
The NIM keeps a record of output data in a block of registers in the process image.
Information in the output data block is written to the NIM by the fieldbus master and
is used to update the output modules. This information can be monitored by the
fieldbus master. If you are not using a basic NIM, the information may also be
monitored by an HMI panel connected to the NIM’s CFG port.
The output data process image is a reserved block of 4096 16-bit registers (in the
range 40001 through 44096) that represents the data returned by the fieldbus
master. An STB AVO 1255 is represented by two contiguous registers in the output
data block. The specific registers used by an STB AVO 1255 module are based on
its physical location on the island bus.
Note: The data format illustrated below is common across the island bus,
regardless of the fieldbus on which the island is operating. The data is also
transferred to and from the master in a fieldbus-specific format. For fieldbus-
specific descriptions, refer to one of the Advantys STB Network Interface Module
Application Guides. Separate guides are available for each supported fieldbus.
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