GEM eSyStep 639 S0 Series Operating Instructions Manual page 37

12.1.4 Direct operation on the IO-Link master
Basics
If the product is to be operated on an IO-Link master, it must be ensured that the GND levels in the product and in the IO-Link
master have the same potential so that there are no compensating currents which would cause damage in the system. This can
be made possible using several procedures.
12.1.4.1 Identical power supply
The IO-Link master is operated from the same power supply as the product.
● Connect pin 4 (CQ) of the master with pin 6 of the product.
However, pin 3 (L-) of the master should not be connected to pin 2 (GND) of the product under any circumstances.
This prevents a ground loop and no unexpected high currents can occur via pin 3 (L-) which can damage the master.
1
2
3
4
A
5
6
7
Item
A
B
C
12.1.4.2 Separate power supply, GND-connected
The IO-Link master and the product can also be operated with different power supply sources if the GND of both power supply
sources is connected. In this case, the master is connected as when the power supply is identical
● Connect pin 4 (CQ) IO-Link master with pin 6 of the product.
Do not connect (pin 3) L- IO-Link master.
1
2
3
4
A
5
6
7
Item
A
B1 and B2
C
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1 1
2 2
(L-)
3 3
CQ
4 4
5 5
eSyStep
Supply voltage
USB IO-Link Master
1 1
2 2
(L-)
3 3
CQ
4 4
5 5
eSyStep
Supply voltages
USB IO-Link Master
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24V
GND
C
PE
Name
24V
C
GND
PE
Name
12 Specific data IO-Link (pin 6)
24V
GND
PE
B
24V
B1
GND
PE
24V
B2
GND
PE
GEMÜ 639 eSyStep
Positioner (Code S0)