Lenze 931K - Manual (Page 15)

PROFIBUS communication
The data telegram
Structure of the receive message
5
l
15 KHB 13.0004−EN 2.1
5 PROFIBUS communication
5.1 The data telegram
The controller supports the communication protocol DP in the power section DP−V0. The
controller and the PLC communicate via receive telegram and response telegram. Enter
parameter numbers (PNU) in these telegrams to address objects of the drive (e.g. process
data and parameter data). Telegrams are transmitted cyclically. The telegram length
depends on the settings of the telegram editor in the SDC.
ƒ Receive telegrams contain output data which is transmitted from the PLC (master)
to the controller (slave).
ƒ Response telegrams contain input data which is transmitted from the
controller (slave) to the PLC (master).
5.1.1 Structure of the receive message
ADR = 1 ADR = 2 ADR = 4 ADR = 8 ADR = 12 ADR = 16
Byte 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 ... ...
Data 3rd PNU
Data 2nd PNU
Data 1st PNU
Control word 1 (PNU 967) ( ^ 54)
Mandatory wildcard (PNU 2010.0)
Telegram identifier (not changeable). Selecting the receive message in the telegram editor automatically
sets the operating mode:
l Receive message 0: "positioning" mode (value of byte 0: E0
h
)
l Receive message 1: "speed control" mode (value of byte 0: E1
h
)
)
Note!
ƒ To enable the PLC to receive the process data from the controller, you have
to assign the corresponding response message to the receive message in
"SDC". (
¶ 24)
ƒ In the PLC you have to enter the identifier in byte 0 of the receive message.
The identifier sets the operating mode of the controller.
– E1
h
: speed control mode
– E0
h
: positioning mode