Rockwell Automation Allen-Bradley 1769-IF4, Руководство пользователя

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Publication 1769-UM002B-EN-P - July 2005
Module Data, Status, and Channel Configuration for the Output Modules 4-31
1769-OF8C and -OF8V Program/Idle to Fault Enable (PFE)
If a system currently in program/idle mode faults, this setting determines
whether the program/idle or fault value is applied to the output. If the
selection is enabled [the bit is set (1)], the module applies the fault value. If the
selection is disabled [the bit is reset (0)], the module applies the program/idle
mode data value. The default setting is disabled.
1769-OF8C and -OF8V Fault Value
Using words each channel’s Fault Value word, you can specify the values the
outputs will assume when the system enters the fault mode. The default value
is 0. Valid values are dependent upon the range selected in the range selection
field. If the value you entered is outside the normal operating range for the
output range selected, the module generates a configuration error.
For example, if you select engineering units for the 0 to 20 mA range and enter
a fault value within the normal operating range (0 to 20000), the module will
configure and operate correctly. However, if you enter a value outside the
normal operating range (for example 21000), the module indicates a
configuration error.
TIP
Not all controllers support this function. Refer to your
controller’s user manual for details.
TIP
Not all controllers support this function. Refer to your
controller’s user manual for details.
EXAMPLE
•
If the default value, 0000, is used and the range selected
is 0 to 20 mA, the module will output 0 mA for all data
formats.
•
If the raw/proportional or engineering units format is
selected and zero is entered as Program/Idle mode
word in the 4 to 20 mA range (for 1769-OF8C) or the
1 to 5V range (for 1769-OF8V), a configuration error
results.
•
See Table 4.17 1769-OF8C Valid Output Data Table
on page 4-33 and Table 4.18 1769-OF8V Valid Output
Data Table on page 4-34for more examples.