
Configuration and Use Manual
67
Configuring I/O
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7.5
Configuring an analog output
You need to configure an analog output if the Model 3711 was purchased with the I/O option, and you
configured the I/O terminals for an analog output. Only one analog output is possible.
To configure the analog output:
1. Click
Configuration > I/O > AO Points
. The Analog Output dialog box, containing two
panels, is displayed. See Figure 7-5.
Figure 7-5
Analog Outputs – General panel
2. Enter the tag to be used to describe this output.
HiHi Alarm
Value, in EUs, to which the input value must rise to generate a
high-high alarm.
Typically set higher than the high
alarm value.
Rate Alarm
Value, in EUs, that represents the maximum amount of change
allowed between updates of the Filtered Value. If the change
between updates is greater than this value, a rate alarm is
generated.
To disable the rate alarm without
disabling other alarms, set the rate
alarm value greater than the span
of the analog input.
Alarm Deadband
Value, in EUs, that is used to define the size of two inactive
zones: one below the low alarm limit and one above the high
alarm limit.
Prevents recurrent setting and
clearing of alarm when the input
value is oscillating around the
alarm limit. Also prevents filling the
alarm log with repetitive data.
RBX Alarming
Specifies the type of Report By Exception alarming for this
input:
• Disabled – No RBX alarming.
• On Alarm Set – RBX alarm generated when the analog input
enters an alarm condition.
• On Alarm Clear – RBX alarm generated when the analog
input leaves an alarm condition.
• On Alarm Set and Clear – RBX alarm generated when the
analog input enters an alarm condition and when the analog
input leaves an alarm condition.
If RBX Alarming is enabled, a
communications port must be
configured for RBX alarming. See
Section 4.6
Table 7-3
Analog Inputs – Alarms parameters
continued
Parameter
Description
Comments
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