4.11 Connecting the analog voltage outputs (optional)
33
4 Setting Up
Version 04 05/2014
– a pass/fail examination to be performed (threshold
value).
– wiring to be carried out on input terminals of a
Profibus I/O module, thereby making the control
system available. As with other process variables, it
is possible to define warning thresholds there and
use them for preventative maintenance.
Signal
output
voltage
0
100
200
300
400
500
600
700
800
900
Optical power input [µW]
1
0
2
0.5
1.5
2.5
3.5
3
4
Reserve
Diagram 1: Correlation of measured output voltage to signal quality
The device has two analog voltage outputs, CH2 and
CH3, each of which supplies a short-circuit-proof output
voltage dependent on the optical power input at channel
2 or channel 3, for diagnosis purposes and, for example,
for preventative maintenance, in the range from 0 - 5 V
(each with reference to “GND” of the 3-pin terminal
block).
The analog voltage outputs are electrically connected to
the front panel/function ground.
These voltage outputs are connected using a 3-pin
screw terminal on the front side of the repeater.
The screw terminal is suitable for cable leads that have
a cross section between 0.2 - 2.5 mm
2
.
The measuring voltage can
– be determined by a standard volt meter
(ungrounded, high-impedance) . This allows
– the incoming optical power to be documented ,
e.g. for later measurements (ageing, damage)
4.11 Connecting the analog voltage outputs (optional)
CH2
GND
CH3
Receive
Signal
Intensity
Fig.13: Analog voltage outputs – connections for 3-pin terminal
block