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E Siemens AG 2013 All Rights Reserved
SIMODRIVE POSMO A User Manual (POS1) – 08/2013 Edition
Communications via PROFIBUS–DP
4.1 General information about PROFIBUS–DP
PROFIBUS–DP is an international, open fieldbus standard and is de-
fined in the following Standards:
S European fieldbus EN 50170 Part 2
S DIN 19245 Part 1 and 3
S IEC 61158
PROFIBUS–DP is optimized for fast, data transfer at the field level for
time–critical applications.
The fieldbus is used for cyclic and non–cyclic data transfer between a
master and the slaves assigned to this master.
For PROFIBUS–DP a differentiation is made between master and slave.
S Master (active bus device)
Devices, which represent a master on the bus, define data transfer
along the bus, and are therefore known as active bus nodes.
For the masters, a differentiation is made between 2 classes:
– DP Master Class 1 (DPMC1):
This designates central master devices which exchange informa-
tion with the slaves in a defined telegram cycle.
Examples: SIMATIC S5, SIMATIC S7, etc.
– DP Master Class 2 (DPMC2):
These are devices to configure, commission, control and visual-
ize with the bus operational.
Examples: Programming units, operator control and visualization
devices
S Slave (passive bus node)
These devices may only receive, acknowledge and transfer mes-
sages to a master when so requested.
Reader’s note
The SIMODRIVE POSMO A positioning motor is a slave on the
fieldbus. This slave is designated ”DP slave POSMO A” in the
following.
General
information
Master and slave
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