Specifications

Analog Output Modules
31007715 6/2008 357
This parameter is represented as an unsigned 8-bit number. To access this
parameter using RTP, the following values to the RTP request block.
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 value, 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.
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 (0xFF)
Step Action Result
1 Double-click the STB AVO 0200 module
you want to configure in the island editor.
The selected STB AVO 0200 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 Configured Value list in the
Channel 1 and Channel 2 rows.
Two choices appear in the list:
z Predefined
z Hold Last Value
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