User guide

Instruction Manual HYDACLab

03.03.2008
7
6.2 Reset via PLC control
To connect the HYDACLab

to the PLC control a voltage divider must be provided on the PLC
switch output as per the diagram below.
Over a period of 8s the HYDACLab

detects a cycle of high-low pulses and resets the sensor.
In normal operating conditions, the level at PIN 5 must be 12 VDC  0.5 V.
1 2 3
1s 1s
8
1s
8s
1s
+12V DC
Once the unit has been reset, the status signal indicates the value 5mA.
7. Electrical Connections
Signal 1
HYDACLab
2
1
3
4
+U
B
Signal 2
RL
5
GND
Signal 1: PNP switch output
Signal 2: Sequential analogue output (4 .. 20 mA)
HSI* / Reset (PLC)
PIN 5: HSI channel / reset (PLC)
R
Lmax
= (U
B
-5V) / 20mA [k] and R ≤ 500 
Note:
The load resistance R
L
is the sum of the internal input resistance of the evaluation unit and the
resistance of the connection lines.
* HSI = HYDAC Sensor Interface (HYDAC internal communication interface)
U
PLC
PLC
HLB1000
Pin 5
R
2
R
1
12 VDC

0.5V