Rockwell Automation 1746-NO8V SLC 500 8-Point Analog Output Module/ User Manual - Manual (Page 34)

Publication 1746-UM026A-EN-P - September 2003
4-10 Configuring the Module
Changing the output data format or range (bits 1 to 6 of the channel
configuration word) will clear or disable user-scaling, clamping, limit
alarms, ramping/rate limiting and preset fault values. Similarly, if
format or range is changed, you must reconfigure the values for each
of these features.
See Setting the Parameter Option Values (Class 3 Only) on page 4-12
for more details about the setting these options.
Fault Options (configuration bits 12 and 13)
This setting allows you to define the output state when a fault
condition occurs. The output may be set to:
•
reset output on fault (go to 0V or 0 mA)
•
hold current value on fault
•
go to a preset value on fault
In Class 1 operation, the output will be set to the reset value when a
fault condition occurs. One exception for Class 1 is if the module’s
chassis slot is disabled. Then the output will hold it’s current value.
IMPORTANT
The values in output word pairs 16 through 31 apply
to each individual channel. If you want to use any of
these features, you must set each channel’s output
word pair.
Fault Occurs
Go to Preset
Hold Current Value
Go to Reset Value
-10V
-5V
0V
2V
10V
TIP
If a channel is configured to “preset output on fault” (bit 12 = 0 and bit 13 = 1) and no
preset fault value was previously set, then the output will go to the reset value (0V or 0
mA) when a fault condition occurs.
TIP
It is recommended that “reset output on fault” is set when a channel is disabled.