User guide and technical documentation
Page
9
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Caution:
Avoid pressure on the inputs/outputs as they could be mechanically damaged.
2.4.2
Connection
There are pluggable screw terminals for the connection of any cable. Purpose of each terminal block contact
is depicted on the top side of the unit case. For wire montage into screw terminals always use appropriate
flat head screwdriver. Do not exceed maximum torque which is stated in the chapter 4.8.
2.4.3
Power supply connection
To ensure correct operation of the unit it is necessary to connect power supply 24 V
⎓
into terminal for +24V
(positive pole) and GND (negative pole) into power supply terminal block. Information about tolerance of
recommended power supply voltage and consumption of electricity are described in detail in the datasheet
of each unit and on the product label.
Caution:
The device has appliance class I. That is why it is also necessary to connect protective ground conductor to
ground connector of the device marked on the case with symbol . For ground conductor connection use
cable eye and provided M4 screw with serrated lock washer.
Note:
DIN rail with the installed unit must be connected to protective ground conductor.
2.4.4
Communication line connection
2.4.4.1
RS-485
RS-485 connection (EIA-485) is done on screw connectors for RS-485 marked as A and B. The unit features
optionally connectable terminator (120
Ω
) marked as RS485-END.
Note:
We recommend that you comply with the following instructions for reliable bus operation:
•
Ensure the shortest possible wiring length between devices
•
Ensure the serial connection of the buses
•
Use shielded cabling, preferably 0.8 mm diameter J-Y(ST)Y and twisted pairs, or FTP CAT6
Connect the cabling shield only on one side of the cable, directly to the switchboard earth terminal, not to
the PLC terminal. The DIN rail on which the unit is installed must also be connected to a protective ground
conductor.
2.4.4.2
RS-232
RS-232 (RS-232C) connection is done on screw connectors for RS-232 marked as RXD, TXD and GND.