User's Manual

Page 46 SITRANS LR 400 – INSTRUCTION MANUAL DRAFT 7ML19985FH01
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Parameters (HART)
In the “Hold...” parameters, the device outputs the last valid value until the set time has
run out or the fault has been eliminated. If the fault persists after the set time runs out,
the analog output switches to an error signal of 3.6 mA.
4.4 Digital Output
4.4.1: parameter DO (F = Alarm)
Assignment of the digital output
Here you can select whether the digital output supplies the upper or lower limit value of
level or volume or an alarm (device error, measurement error; see parameter 3.1) to the
control system. If you select the “No function” option, the digital output is switched off.
Selection of a limit value enables parameter 4.4.3.
4.4.2: Error Level (F = D: Error Signal)
Level for the error signal to alarm in Analog or Digital output
When D is selected, all errors are displayed. When D+F is selected, there is special
handling for failsafe. When D+F+W is selected, there is special handling for warnings.
4.4.3: Signal Type DO (F = Relay closes)
Here you can determine the behavior of the digital output. Select whether its contact
closes or opens at an event.
Value
MaxLim Level
MinLim Level
MaxLim Volume
MinLim Volume
Alarm
No Function
Value
D: Error Signal
D+F: Error Signal
D+F+W: Error Signal
Value
Relay closes
Relay opens
chap6.fm Page 46 Tuesday, October 9, 2001 2:26 PM