Functions
5.11 Operation in fieldbus systems
CU240S and CU240E Control Units, FW 3.2
Operating Instructions, 03/2009, A5E02440075B AA
161
The number of PZD words in a USS telegram is defined by parameter P2012. The first two
words are:
● Control 1 (STW1) and main setpoint (HSW)
● Status word 1 (ZSW1) and main actual value (HIW)
If P2012 is greater than or the same as 4, the additional control word (STW2) is transferred
as the fourth PZD word (default setting).
The sources of all the other PZDs are defined with parameter P2019 for an RS 485 interface
and with P2016 for an RS 232 interface.
5.11.3 Communication via PROFIBUS and PROFINET
5.11.3.1 Connect the frequency inverter to PROFIBUS
Assignment of the SUB-D connector to connect to the PROFIBUS-DP network
Control Units CU240S DP and CU240S DP-F of the inverter are equipped with a SUB D
connection to connect to the PROFIBUS cable.
Table 5- 74 Contact assignment of the 9-pole SUB D connection
Contact Designation Description Area
1 Shielding Ground connection
2 U0V Floating and reference point for user
supply
3 RxD/TxD-P Receive/transmit data P (B/B’) RS 485
4 CNTR-P Control signal TTL
5 DGND Reference potential for PROFIBUS
data (C/C’)
6 VP Plus pole for supply voltage 5 V ± 10 %
7 U24V Floating user supply +24 V at 100 mA
8 RxD/TxD-N Receive/transmit data N (A/A’) RS 485
9 - Not assigned
Housing Cable shield Cable shield
The SUB D connection is suitable for the SIMATIC RS 485 bus connector.
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