BERTHOLD TECHNOLOGIES LB 480, User Manual

Page: 357 / 450

SENSseries LB 480 Level measurement
BERTHOLD TECHNOLOGIES GmbH & Co. KG
3 – 357
Volume 3 Menu Structure
3
2.30
Digital Output
Menu path: Device Config

Setup

I/O Setup

Digital
Output .
The digital output provides a wiring for different signals. Without
additional I/O cards the digital output is an open collector which is
switched fail safe. This means that the transistor is conductive, as
long as no alarm is reported and is blocked if an alarm is signaled.
For more information on the digital output, see
Volume 2 in chapter
3 , "Electrical Installation", page 2-217 .
IMPORTANT
If you use the setting NORMAL in the menu Error Handling
(  Setup  Signal Condition  Signal
Parameter

Error Handling ), only errors are reported via the
current output. Alerts can then be received only through one of the
following signal outputs:
–
via the digital output as a binary signal
– via the HART
®
signal as a text message
1 Digital Out Function

Here you can define the switching function of the digital output.
You have the following setting options:
• ALARM
The alarm is triggered when the threshold (alarm threshold for
the level) is exceeded or fallen short of, i.e. it reacts in parallel
with the current output signal. The switching behavior is depen-
dent on the switching function selected at
Switch Function
( Device Config

Setup

Cal Parameter

Cal Settings

Switch Function , page 3-359 ).
If an error occurs, the digital output goes to alarm.
• DET. TEMP
The alarm is triggered when the detector temperature is below
or above the permissible temperature range. The temperature
range is specified in
Sensor Temperature ( Device Config

Setup

I/O Setup

Digital Output

Temp. Threshold
Settings , page 3-360 ).
• HOLD
The alarm is triggered when the measurement is on hold, i.e.
the measured value is frozen. This can be caused, for example,
by the digital input or by RID.
• W ERROR
The alarm is triggered when the detector signals an error or
reports a warning. In
chapter 8 on page 3-429 you find a list of
possible causes and troubleshooting procedures.