Functions
5.11 Operation in fieldbus systems
Frequency inverter
Operating Instructions, 08.10. 2008, t.b.d.
151
CAUTION
A difference in the ground potential between the master and slaves in an RS 485 network
can damage the converter Control Unit. You must make absolutely sure that the master
and slaves have the same ground potential.
SUB D connection on the CU 240S (pin assignment)
The CU240S Control Units are equipped with a 9-pole SUB D socket for connecting the
inverter via an RS 485 interface. A standard 9-pole SUB D connector with a 180° cable outlet
can be used for the USS connection via RS 485.
Table 5- 48 Contact assignment of the 9-pole SUB D socket
Con
tact
Description Description
1 - Unused
2 - Unused
3 RS 485P Receive and transmit signal (+)
4 - Unused
5 0 V Ground reference
6 - Unused
7 - Unused
8 RS 485N Receive and transmit signal (-)
9 - Unused
X Shield
(housing)
Equipotential bonding
Cable lengths and number of devices
Table 5- 49 Max. no of devices and cable length
Baud rate in bit/s Max. no. of devices Max. cable length
9600 32 1200 m
19200 32 1200 m
38400 32 1200 m
57600 32 1200 m
115200 (max. baud rate) 30 1000 m
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