Rockwell-automation 1746-NO8V SLC 500 8-Point Analog Output Module/ Us Uživatelský manuál stáhnout pdf (Strana 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

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.

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Rockwell-automation 1746-NO8V SLC 500 8-Point Analog Output Module/ Us Uživatelský manuál Strana 34