User Manual

4/12 Bosch Rexroth AG
DSM Series 10
RE 95132/11.08
Block circuit diagram
–
–
+ +
U
sensor
U
RM
R
M
I
low,
I
high
U
V
A two-wire current interface is used for signal transmission.
A current signal is supplied by the sensor. The low current
(I
low
= induced current of the active element) is interpreted
as low-signal. The high current (I
High
= I
low
+ ∆I; ∆I = addi-
tional current through a path parallel to the active element) is
interpreted as high signal. In the controller, the current coming
from the sensor is converted to a voltage signal by a measuring
resistor R
M
. The evaluation circuit detects whether the signal
is high or low by the size of the voltage.
U
Sensor
Sensor operating voltage
U
V
Supply voltage
U
RM
Signal voltage at measuring resistance
I
low
, I
high
Signal current level
R
M
Measuring resistance