Rockwell Automation 1769-IF4FXOF2F Compact Combination Fast Analog I/O Module - Manual (Page 53)

Publication 1769-UM019A-EN-P - October 2008 53
Module Data, Status, and Channel Configuration Chapter 3
Clamp High and Clamp Low Data Values
Clamping is disabled on a per channel basis for each output channel
by entering a 0 value in both the clamp high data value and clamp
low data value words in the configuration-data file. If either the clamp
high data value or clamp low data value words have a non-zero value
entered, clamping is enabled for the corresponding output channel.
Non-zero clamp data values are considered valid only if they are
within the full-range limits set by the type/range and data format
selections for the channel. Also, the clamp data values are valid only if
the high clamp data value for an output channel is greater than or
equal to the low clamp data value.
Latch Clamp Status (LC)
If the selection is enabled (LC = 1), the module latches any clamp
status bits that are set in the Input Data file. Latched clamp status bits
must be reset via the Output Data file. If the selection is disabled
(LC = 0), any clamp status bits that are set in the Input Data file are
automatically reset when the clamp limits are no longer exceeded by
the controller. The default setting is disabled.
Enable Low Clamp Alarm Interrupt and Enable High Clamp Alarm Interrupt
(ELI and EHI)
If the selection is enabled (ELI = 1 or EHI = 1), the module generates
a module interrupt to the controller. A separate interrupt can be
enabled for each output channel’s high clamp status and low clamp
status. If the selection is disabled (ELI = 0 or EHI = 0), no module
interrupts are generated when output clamp status bits are set. The
default setting is disabled.
Output Ramping
Ramping limits the speed at which an output signal can change. This
prevents vast transitions in the output from damaging the output
controls.
Ramp to Fault mode is the only type of ramping supported by the
module. This type of ramping occurs when the present output value
changes to the fault value after a change in the controller's status to
Fault mode has occurred.
TIP
N
Not all controllers support alternate output states and this
function. Refer to your controller’s user manual for details.