Communications Via Profibus-Dp; General Information About Profibus-Dp - Siemens SIMODRIVE POSMO A User Manual

Communications via PROFIBUS–DP
4.1 General information about PROFIBUS–DP
General PROFIBUS–DP is an international, open fieldbus standard and is de-
information fined in the following Standards:
S
S
S
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.
Master and slave For PROFIBUS–DP a differentiation is made between master and slave.
S
S
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.
E Siemens AG 2013 All Rights Reserved
SIMODRIVE POSMO A User Manual (POS1) – 08/2013 Edition
European fieldbus EN 50170 Part 2
DIN 19245 Part 1 and 3
IEC 61158
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
Slave (passive bus node)
These devices may only receive, acknowledge and transfer mes-
sages to a master when so requested.
4
4
4-99