Specifications

Analog Output Modules
342
31007715 6/2008
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 channel goes to a known state where it remains until
communication is restored. This known state is the channel’s fallback state. Fallback
configuration is accomplished in two steps:
1. configure the fallback mode for the channel
2. configure the fallback state
This output channel has a fallback mode—either predefined state or hold last value.
When the 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.
By default, the fallback mode for the channel is 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 0120 module
you want to configure in the island editor.
The selected STB ACO 0120 module
opens in the software module editor.
2 Click the + sign to expand the Fallback
Mode row.
The row for Channel 1 appears.
3 Select the desired fallback mode setting in
the Configured Value list in the Channel
1 row.
Two choices appear in the list:
z Predefined
z Hold Last Value
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