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Technical Manual
Absolute Single/Multiturn Profibus Encoders
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Before a PROFIBUS‐DP system can be started up, unique bus addresses must be assigned to all connected
stations, including the Master system. This is the only way to ensure unambiguous addressing on the bus. The
station addresses should be assigned via the bus at first.
The physical system settings are made using the parameter set of the Master. In addition to the bus address of
the Master, this set includes, for example, the baud rate, the time‐out delays and the number of repetitions of the
transmission. Along with the Master parameter set, a Slave data set must be saved for each Slave to be activated.
A data set contains the parameter assignment and configuration data of the Slave and the address indicator for
the logical storage of the I/O data. If the parameter sets are present, then either at the request of the user or
automatically the Master system begins to start the Slaves up, one after the other. The first so‐called diagnostic
cycles are able to show, which slave is present on the bus. Only those Slaves, which sent a correct feedback during
the diagnostic cycle, will subsequently be parameterized in the parameter cycles with the corresponding data
stored in the Master. If this has been correctly carried out, then configuration cycles follow, during which a
comparison is made between the required configuration data stored in the Master and the actual configuration
data of the Slave. After the last diagnostic cycle, each Slave for which no error was detected during the
comparison is ready for operation. Each of these Slaves is then integrated automatically by the Master in the
operating data transfer.
For diagnostic purposes, the Master provides a diagnostic buffer for each Slave, which can be read by the user for
other purposes. To simplify the diagnostics, a general diagnostic field is kept simultaneously, which shows bitwise
whether a Slave has diagnostic data ready or not.
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Installation instructions for RS‐485
All devices are connected within a bus structure (line). Up to 32 stations (Master or Slaves) can be linked together
in one segment. The bus is terminated at the beginning and at the end of each segment by an active bus
termination (termination resistors). To ensure disturbance‐free operation both bus terminations must always
remain powered. The bus termination is provided ready‐to‐activate in the device of in the connector.
When there are more than 32 stations on the bus, repeaters must be inserted to connect the individual bus
segments.
Node Attachment
The nodes are attached to the LAN cables via bus connectors or cable leads, bus terminals or RS‐485 repeaters.
Cable Termination
Each bus segment must be terminated at both ends with its characteristic impedance. This cable terminator is
integrated in the RS‐485 repeaters, the bus terminals, the ILM and the bus connectors and can be activated if
required. Before the cable terminator can be activated, the component must be supplied with power. With the
bus terminals and the bus connectors, this power is supplied by the connected DTE, whereas the RS‐485 repeater,
the ILM, and the terminator have their own power supply. The RS‐485 transmission technique allows the
attachment of a maximum of 32devices (DTEs and repeaters) per bus segment. The maximum permitted cable
length of a segment depends on the transmission rate and the LAN cable used.
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