2.1 Non operating mode related functions
7
2 General Functions
Version 2.4 04/07
2 General Functions
Transmission rate
The OZD Profi 12M … support all the transmission
speeds (transmission rates) defined in the EN 50170
standard:
9.6 kBit/s, 19.2 kBit/s, 45.45 kBit/s, 93.75 kBit/s,
187.5 kBit/s and 500 kBit/s,
and additionally
1.5 MBit/s, 3 MBit/s, 6 MBit/s and 12 MBit/s.
The transmission rate is set automatically as soon as the
OZD Profi 12M … receives a frame. The setting or ad-
justment is dependent on the transmission rate and the
set operating mode. Depending on the OZD Profi 12M … ,
this can last up to several seconds.
If the transmission speed has not been recognized, the
outputs of all ports are blocked. If the transmission rate
changes during operation, this is detected by the modu-
les, which then automatically adjust their settings accor-
dingly.
Transfer malfunctions may temporarily occur while the
rate is being altered.
Signal regeneration
The modules regenerate the signal form and amplitude
of the data received. This allows up to 122 OZD Profi
12M … to be cascaded (limited by the address space in
PROFIBUS networks).
Help when setting up
At least one bus subscriber must be switched on and
active in order to check the optical fiber connections
during the installation. This bus subscriber serves as the
frame source. The OZD Profi 12M … act passively when
it is switched on. They recognize the transfer speed from
the frames sent by the bus subscriber. An optical help
when putting the device into operation is provided by the
port LED which then lights up.
The operating mode is set using switches located on the
top of the module. A sticker attached to the side of the
module provides assistance with the settings.
Segment monitoring at the RS 485 port
If the operating mode ”Electric port with segment moni-
toring“ is set, each receiver monitors the RS 485 bus
segment connected to it for faulty frames or continuously
busy networks. If faulty frames are received by the receiver,
or if the network is busy for longer than the maximum
permitted send time, forwarding of the received signals
is blocked until frames can be received again correctly,
or if no signal is received for one second.
The RS 485 bus segment is not monitored in the opera-
ting mode ”Electric port without segment monitoring“.
Interference from the electrical segment affects the entire
network.
Please observe the installation notes in 4.5.4. ”Connec-
ting the electric RS 485 bus lines“, p. 24.
The following functions are only available for the optical
ports. Whether the functions can be activated depends
on the operating mode which has been set. Please refer
to the following chapters for details.
2.1 Non operating mode related functions
2.2 Operating mode related functions
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