09.02 Start-Up
Siemens AG 6SE7087-6AK85-1AA0
4-71
Rectifier/Regenerating Unit Operating Instructions
Recommended circuit for connecting SCB1 to SCI1 and SCI2 using fiber optic cables:
SCB1
SCI2
SCI1
U121 U125
U425
U421
U435 U431
X427 X437
24V
X428X429 X438X439
WARNING
If the 24 V voltage supply for an SCI slave fails which data are being exchanged
between the SCB1 and an SCI, then the "1" signal applied at a binary input is sent to
the SCB1 or SIMOVERT 6SE70 as an "0" shortly before the power finally fails.
In contrast, the "1" remains applied in the SIMOVERT 6SE70 in the event of an
interruption in the fiber optic connection.
4.5.4.2 SCB1 as peer-to-peer interface
Process data can be passed quickly in a train from unit to unit (between SCB1 master boards) via the peer-to-
peer interface. The data to be transmitted from the device are treated like actual values. As a result, they can be
parameterized with the existing PZD gating mechanisms (P690). Data to be sent are connected via another
interface in the same way as an actual-value output.
The transferred data cannot be manipulated (e.g. multiplication by a factor).
The first device at the beginning of the peer-to-peer chain feeds the required setpoints into the chain using the
relevant visualization parameters.
The data received are treated in the same way as other externally supplied setpoints and connected to the
appropriate source parameters.
Control word bits can be extracted individually from the peer-to-peer telegram and gated with other bits to make
an internal control word. In this case, control word 1 is transferred as the 1
st
word and control word 2 as the 4
th
word in the peer-to-peer telegram.
4.5.4.3 Diagnostic tools:
LED display on SCB1:
LED on Reset state
LED flashing Normal operation
LED off Error
LED display on SCI1 or SCI2 slave:
LED on Reset state
LED flashing 12Hz frequency No telegram traffic (e.g. fiber optic cable not
connected)
5Hz frequency Faulty telegram traffic (e.g. fiber optic ring
interrupted or other slave has no supply
voltage)
0.5Hz frequency Normal operation
LED off Error
Details about fault or alarm messages which may occur in relation to SCB1 or SCI (F070 to F079 and A049 to
A053) can be found in Section 7.
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