System overview
2.3 IO-Link interface
IO-Link system
Function Manual, 12/2017, A5E31637677-AB
13
Two types of ports are distinguished in the specifications for IO-Link masters:
● Port Class A (Type A)
With this type, the functions of pins 2 and 5 are not assigned. The manufacturer defines
this function. Generally, an additional digital channel is assigned to pin 2.
Figure 2-3 Pin assignment Port Class A
● Port Class B (Type B)
This type offers an additional supply voltage and is suitable for the connection of devices
that have an increased power requirement. In this case an additional (galvanically
isolated) supply voltage is made available by pins 2 and 5. A 5-wire standard cable is
required to use this additional supply voltage.
Figure 2-4 Pin assignment Port Class B
The devices are connected to the master with unshielded 3-wire or 5-wire standard cables
with a maximum length of 20 m. Standard cables can be used to wire the sensors. No
shielding or compliance with specific regulations is necessary for the installation of the
cables.
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