Specifications

Analog Output Modules
31007715 6/2008 297
This parameter is represented as an unsigned 8-bit number. To access this
parameter using RTP, the following values to the RTP request block.
Output
Data Format
By default, the data format is signed values with 15-bit resolution.
If you are using the Advantys configuration software, you can change the data
format to unsigned values with 16-bit resolution.
The output data format that you use affects the range of values available for a
predefined fallback state.
Fallback Modes When communications are lost between the output module and the fieldbus master,
the module’s output channels go to a known state where they remain until
communications are restored. This is known as the channel’s fallback state. You
may configure fallback states for each channel individually. Fallback configuration is
accomplished in two steps:
1. configure the fallback modes for each channel
2. configure the fallback states
All output channels have a fallback mode—either predefined state or hold last value.
When a channel has predefined state as its fallback mode, it can be configured with
a fallback state, which may be any value in the valid range. When a channel has hold
last value as its fallback mode, it stays at its last known state when communication
is lost; it cannot be configured with a predefined fallback state.
By default, the fallback mode for both channels is a predefined state. If you want to
change the fallback mode to hold last value, you need to use the Advantys
configuration software.
Length 1
Index (low byte) 0x10
Index (high byte) 0x23
Sub-index 0
Data Byte 1 5 to 255
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 Click the + sign to expand the + Fallback
Mode row.
Rows for Channel 1 and Channel 2
appear.
3 Select the desired fallback mode setting in
the Value list in the Channel 1 and/or
Channel 2 row.
Two choices appear in the list:
z Predefined
z Hold Last Value
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