Leroy-Somer digitax st User Manual page 9

Figure 2-2 shows a typical PROFIBUS-DP network system transferring the same
signals as given in the traditionally wired example. The signals are now transmitted by
converting them into a serial data stream which is received by the master as if they were
connected using traditional wiring. The data stream on SM-PROFIBUS DP-V1 allows up
to 64 (32 input and 32 output) independent values to be sent or received by the master,
in addition to a single channel allowing for random access to drive parameters.
Figure 2-2 PROFIBUS DP cable layout
Table 2.2 Data mappings for SM-PROFIBUS DP-V1
Number of
network
words
1
1
1
1
1
1
Table 2.2 details the number of data words used to communicate the signals using the
PROFIBUS-DP network. It can be seen that the resulting reduction in cabling is
significant.
PROFIBUS-DP can transfer data using two distinct modes. The first of these modes is
cyclic where signals are sent in predefined blocks at regular intervals. This is the
equivalent of the hard-wired example in Figure 2-1.
SM-PROFIBUS DP-V1 User Guide
Issue : a
PROFIBUS master
Digital 1A
Analog 1
Type Source / Destination
digital Inputs slave 1 to master
digital outputs master to slave 1
analog output master to slave 1
digital inputs slave 2 to master
digital outputs master to slave 2
analog output master to slave 2
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Analog 1 Analog 2
Digital 1B Digital 2A Digital 2B
Analog 2
Description
status signals
control signals
control signal
status signals
control signals
control signal
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