Rockwell Automation 1769-OF4VI Compact I/O Isolated Analog Modules - Manual (Page 65)

Publication 1769-UM014B-EN-P - May 2010
Module Data, Status, and Channel Configuration for the Output Modules 4-13
Hold for Initialization
Hold for Initialization causes outputs to hold present state until the value
commanded by the controller matches the value held by the module providing
a bumpless transfer.
If Hold for Initialization is selected, outputs hold if any of these three
conditions occur.
 Initial connection is established after cycling power
 New connection is established after a communications fault occurs
 Transition to Run mode from Program state
The Output Held bit (see the Input Data file) for a channel indicates that the
channel is holding.
1769-OF4CI and -OF4VI Fault Mode (FM)
This configuration selection provides individual fault mode selection for the
analog channels. When this selection is disabled [the bit is reset (0)], the
module holds the last state, meaning that the analog output remains at the
last converted value prior to the condition that caused the control system to
enter the program mode.
If this selection is enabled [the bit is set (1)] and the system enters the program
mode, it commands the module to convert the user-specified value from the
channel’s Fault mode word to the appropriate analog output for the range
selected.
IMPORTANT
Hold last state is the default condition for the 1769-OF4CI
and -OF4VI during a control system run-to-program mode
change.
TIP
The MicroLogix 1500 and CompactLogix controllers do
not support Hold Last State. This functionality is only
supported when the analog module is used on the
DeviceNet network via the 1769-ADN adapter.
TIP
Not all controllers support this function. Refer to your
controller’s user manual for details.