Siemens SINUMERIK 840Di System Overview page 22

3 Hardware
PLC
The hardware of the PLC functionality has been implemented by a SIMATIC S7
CPU 315-2 DP integrated in the MCI Board. Therefore, it is compatible with the
PLC submodule of the SINUMERIK 840D. The connection of the I/Os is carried out
via the PROFIBUS-DP interface of the MCI Board.
The PLC provides a class 1 DP master (central PLC) at PROFIBUS DP.
PROFIBUS-DP interface
The PROFIBUS-DP interface (max. 12MBaud, electrical) of the MCI Board is used
to connect the SINUMERIK 840Di to the drives and the I/Os.
The PROFIBUS-DP connection with Motion Control functionality comprises the
extended PROFIBUS profile PROFIDrive, which defines the synchronous and
equidistant communication at PROFIBUS DP for speed-variable drives.
For the specification of this profile, please refer to:
PROFIDrive Profile, Drive Technology, Draft V1.4.2, 01st Sept., 00
With the SINUMERIK 840Di, it is thus possible to control drives from the NC in
speed/torque control mode and from the PLC in Positioning mode. To achieve this,
NC and PLC can internally access the PROFIBUS-DP interface of the MCI Board
at the same time.
With the SINUMERIK 840Di, the data transfer rate at PROFIBUS DP is set to 12
MBaud by default.The PROFIBUS-DP interface is designed as a 9-pin SUB D fe-
male connector.
MPI interface
The MPI interface of the MCI Board can be used to connect the SINUMERIK 840Di
with the optional components:
•
machine control panel
•
programming device (e.g. PG 740)
•
PP 031-MC pushbutton panel
•
HT6 handheld terminal
With the SINUMERIK 840Di, the data transfer rate at the MPI bus is set to
1.5 MBaud by default. The MPI interface is designed as a 9-pin SUB D female
connector.
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© Siemens AG 2001 All Rights Reserved
SINUMERIK 840Di System Overview (SYI) - 02.2001 Edition
02.2001