Lenze Drive Server Bus server S7 getting started - Manual (Page 38)

Busserver S7
L
99 Busserver S7 DE/EN 1.0
Output parameters:
• Global Drive Control (GDC) and DriveServer were used to load a complete parameter set.
• An S7-315 (cycle time: 15 ms) and an S7-412 (cycle time: 2 ms) were used as PLC.
• PROFIBUS was set to 1.5 Mbit/s.
• Different interface modules were used.
• MPI baud rate: 187.5 Kbaud
• Baud rate of the serial interface for PC adapter connection: 38.4 Kbaud
Transfer times detected for one parameter set:
PLC Interface module
Type Connection Controller PC-PLC connection Transfer time
S7-315 PROFIBUS on the CPU 82xx vector CP5511 (187.5 Kbaud) 44 s S7 315
CP342-5 82xx vector CP5511 (187.5 Kbaud) 54 s
PROFIBUS on the CPU 93xx CP5511 (187.5 Kbaud) 107 s
CP342-5 82xx vector 60 s 64 s
S7-412 PROFIBUS on the CPU 82xx vector (FIF) CP5511 12 s S7 412 PROFIBUS on the CPU
82xx vector (AIF) CP5511 13 s
82xx vector (FIF) PC adapter 24 s
82xx vector (FIF) Ethernet 11 s
93xx CP5511 30 s
93xx PC adapter 56 s
93xx Ethernet 28 s
Summary:
• The transfer time mainly depends on the cycle time of the PLC.
The longer the cycle time, the lower the influence of the bus rates.
• A fast connection between PC and PLC accelerates data transfer. Yet, the cycle time remains
the limiting factor.
• Some CPU cards permit the baud rate of the MPI bus to be set to up to 12 Mbit/s. If technology
allows, this increase in speed should be taken advantage of.
• However, the PROFIBUS transfer rate only has a minor influence on the transfer time of a
parameter set.
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