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3. Installation
Warning
The CIM 2XX must only be connected to
SELV or SELV-E circuits.
3.1 Connecting the Modbus
A screened, twisted-pair cable must be used. The
cable screen must be connected to protective earth
at both ends.
Recommended connection
Colour
Modbus terminal
code
D1
Yellow
D0
Brown
Common/GND
Grey
Fitting the cable
Procedure:
See fig. 3.
1. Connect the yellow conductor(s) to terminal D1
(pos. 1).
2. Connect the brown conductor(s) to terminal D0
(pos. 2).
3. Connect the grey conductor(s) to terminal
Common/GND (pos. 3).
4. Connect the cable screens to earth via the earth
clamp (pos. 4).
It is important to connect the screen to
earth through the earth clamp and to
Note
connect the screen to earth in all units
connected to the bus line.
Maximum cable length, see section
resistor.
Master
Slave
Slave
LT = Line Termination
(termination resistor)
Slave
Fig. 2
Example of Modbus network with
termination
* Hardware unit enabling connection to the Modbus
network.
Data signal
Positive
Negative
Common/GND
3.3 Termination
*
Slave
Slave
3
2
1
4
Fig. 3
Example of Modbus connection as
daisy chain
Pos.
Description
1
Modbus terminal D1
2
Modbus terminal D0
3
Modbus terminal Common/GND
4
Earth clamp
3.2 Setting the Modbus address
The CIM 2XX Modbus module has two hexadecimal
rotary switches for setting the Modbus address.
The two switches are used for setting the four most
significant bits (SW6) and the four least significant
bits (SW7), respectively. See fig. 4.
Fig. 4
Setting the Modbus address
The table below shows examples of Modbus address
settings.
For a complete overview of Modbus addresses, see
the table on page 199.
The Modbus address must be set
Note
decimally from 1 to 247.
SW6
SW7
7
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