Specifications
Analog Output Modules
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31007715 6/2008
STB ACO 0120 Data in the Process Image
Representing
the Analog
Output Data
The NIM keeps a record of output data in one 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 sent by the fieldbus master.
An STB ACO 0120 is represented by one register in the output data block. The
specific register used by an STB ACO 0120 module is based on its logical address
on the island bus.
Output
Data Registers
Each STB ACO 0120 output data register represents the output data in the IEC data
format. The data has 15 bit + sign resolution.
All 16 bits in the data word are significant. They allow you to represent analog output
current data with all the integer values in the range -1 000 to 32 767.
The value 0 represents 4 mA. The value 32 000 represents 20 mA. Errors and
warnings are reported in both operating ranges at the following counts.
Note: Errors and warnings are based on count values, not current values. The
current values in the table below are ideal values.
sign
2
14
2
13
2
12
2
11
2
10
2
9
2
8
2
7
2
6
2
5
2
STB ACO 0120 Data Register Format
12345679101112
13
14
15
0
8
0
2
1
2
2
2
3
2
4
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