REXROTH EFC 3600 - Relationship between Communication Rate and Cables; EMC Measures; Periodical Data Communication

Standard Siemens PROFIBUS cable is (MLFB) 6XV1830-0EH10 (Type
A), and connector is 6ES7972-0BA12-0XA0.
13.3.5 Relationship between Communication Rate and Cables
Relationship between communication rate and cable length is described in table
below.
Baud rate
Maximum length for each cable in [m]
(Type A)
Maximum length for each cable in [m]
(Type B)
9.6 ~ 93.75 kbps 1,000 1,000
187.5 kbps 1000 600
500 kbps 400 200
1.5 Mbps 200 200
3 ~ 12 Mbps 100 100
Tab. 13-29: Relationship between communication rate and cable length
13.3.6 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.
13.3.7 Periodical Data Communication
PPO data type
PROFIBUS-DP defines data structure for periodical data communication as PPO
(the Parameter Process date Object). EFC 3600 PDA models support 5 PPO
types shown in figure below. PPO message is divided into two data areas in
terms of transmission data contents:
Parameter area (PKW area): read or write a parameter of a of slave.
Process data area (PZD area): including control word and set frequency (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 detailed
descriptions of PKW parameter area and PZD process data area, please refer to
descriptions follow.
EFC 3600
Bosch Rexroth AG
Communication Protocols
DOK-RCON03-EFC-3600***-IT03-EN-P
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