Specifications

Analog Output Modules
296
31007715 6/2008
STB ACO 0220 Functional Description
Functional
Characteristics
The STB ACO 0220 module is a two-channel analog output module that sends data
to two current field actuators. It supports user-configurable operating parameters
and reflex actions. The following operating parameters are user-configurable:
z analog output data format
z analog output period
z predefined fallback value
z channel settings
z fallback mode settings
Using the RTP feature in your NIM, you can access the value of the analog output
period.
Refer to the Advanced Configuration chapter in your NIM manual for general
information on RTP.
Analog
Output Period
If the data to an analog output channel is not updated by the fieldbus master in a
specified number of milliseconds, the module refreshes the old data held by the
channel. This update keeps the analog value from drifting during a long interval
between data updates. The interval between refreshes is defined as the analog
output period. This period is user-configurable in the range 5 to 255 ms.
The analog output period is configurable as a decimal or hexadecimal value in the
range 5 to 255 (0x5 to 0xFF). By default, the analog output period is 10 (0xA). If you
want to configure a different period, you need to use the Advantys configuration
software.
Note: Standard NIMs with firmware version 2.0 or later support RTP. RTP is not
available in basic NIMs.
Step Action Result
1 Double-click the STB ACO 0220
module you want to configure in
the island editor.
The selected STB ACO 0220 module opens in the
software module editor.
2 Choose the data display format by
either selecting or clearing the
Hexadecimal check box at the
top right of the editor.
Hexadecimal values will appear in the editor if the
check box is selected; decimal values will appear
if the check box is cleared.
3 In the Value column of the
Analog Output Period row, enter
the desired value.
Notice that when you select the Analog Output
Period value, the max/min values of the range
appear at the bottom of the module editor screen.
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