14.4.5 EMC Measures
The following EMC measures needs to be taken in order to improve the stability
of PROFIBUS communication network:
●
The shielding layer of the communication cables must be well grounded at all
stations; a large area is required for the connection of the shielding layer to
obtain a low impedance.
●
A certain wiring distance (≥ 20 cm) must be kept between the communication
cables and the power cables.
●
Communication cables and power cables must be orthogonal in case of cross-
ing.
●
All stations in the network must be grounded to the same grounding network.
14.4.6 Periodical Data Communication
PPO telegram type
PROFIBUS-DP defines data structure for periodical data communication as PPO
(the Parameter Process date Object). Frequency Converter EFC x610 supports 8
PPO telegram types shown in figure below. PPO message is divided into two da-
ta areas in terms of transmission data contents:
Parameter area (PKW area): read or write a parameter of a slave.
Process data area (PZD area): including control word and set frequency, etc.
(data flow from master to slave), or status word, actual output frequency and
other status monitoring values of slave (data flow from slave to master). For de-
tailed descriptions of PKW parameter area and PZD process data area, please
refer to descriptions follow.
EFC x610 Series
Bosch Rexroth AG
Communication
DOK-RCON03-EFC-X610***-IT05-EN-P
277/389
