Function Description - WAGO 750-645 Manual

32 • 750-645 [2AI/2DO VIB VRMS/SPM Multi]

Function Description

4.1.1.6 Function Description
The VIB-I/O module is equipped with a self-monitoring function recognizing
a short-circuit at the sensor or an open circuit in the signal path. These faults
are signaled after approx. 1-2 seconds via the 'Sys ok'-LED at the module and
output via the corresponding 'System OK'-output, independent from the
defined delay time.
The VIB-I/O module processes the measured machine signals and compares
them with warning and alarm thresholds that are set in parameters.
If the level exceeds one of these limiting values and after a user-defined delay
time is elapsed, a digital output is activated and the corresponding LED
('Alarm'/'Warn') will light up at the module. The LED and the digital output is
only activated when the signal level is continually beyond the defined
threshold value.
A delay time for a warning/alarm condition can be defined, after which the
corresponding output and LED is activated. This prevents short-time signal
peaks, such as those which occur during the start-up of machine, that will
trigger a warning or an alarm.
If the signal level rises beyond the defined alarm threshold and the delay time
is elapsed, the alarm output changes from 0 V to 24 V. When the signal
returns below the alarm threshold, the alarm output will be set back to 0 V
after approx. 3 to 4 seconds.
The output 'System ok' will fall from 24 V to 0 V in the case of faults (open
circuit, short-circuit, power failure) and also when exceeding the defined
warning threshold and delay time is elapsed. When the fault is corrected or the
machine again runs in normal range, the output will return to 24 V after 3 to 4
seconds.
WAGO-I/O-SYSTEM 750
I/O-Modules