3 Mounting and Commissioning
408
7SA522 Manual
C53000-G1176-C155-3
Figure 3-21 PC interfacing via modem — schematic example
Checking a Con-
nection Using
Direct Link
For two devices linked with fibre optical cables (as in Figure 3-20 or 3-21), this con-
nection is checked as follows. If two or more devices are linked or, if two devices have
been (double-) linked with a ring topology, first check only one
link.
• Both devices at the link ends have to be switched on.
• Check in the event log or in the spontaneous annunciations:
– If the message ´3,ZLWKµ (protection data interface 1 connected with FNo.
3243) is provided with the device index of the other device, a link has been es-
tablished and one device has recognized the other.
– If the protection data interface 2 has also been connected, a corresponding
message will appear ´3,ZLWKµ (FNo. 3244).
• In case of an incorrect communication link, you see the message ´3,'DWD
IDXOWµ (FNo. 3229) or ´3,'DWDIDXOWµ (FNo. 3231). In this case, check the
fibre optical cable link again.
– Have the devices been linked correctly and no cables been mixed up?
– Are the cables free from mechanical damage, intact and the connectors locked?
– Otherwise repeat check.
Continue with the margin title “Consistency of Topology and Configuration”.
Checking a Link
with a
Communication
Converter
If a communication converter is used, please note the instructions enclosed with the
device. The communication converter has a test setting where its outputs are looped
back to the inputs.
Links via the communication converter are tested by means of local loop-back (Figure
3-22, left).
Figure 3-22 Distance protection communication via communication converter and communication network - example
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