Siemens siprotec 7SA6, Manual

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Installation and Commissioning
8-42
7SA6 Manual
C53000-G1176-C156-2
RS485
Termination The RS485 interface is capable of half-duplex service with the signals A/A' and B/B'
with a common relative potential C/C' (DGND). Verify that only the last device on the
bus has the terminating resistors connected, and that the other devices on the bus do
not. The jumpers for the terminating resistors are on the interface module RS485
(Figure 8-21) or on the Profibus module (Figure 8-22).
If the bus is extended, make sure again that only the last device on the bus has the
terminating resistors switched in, and that all other devices on the bus do not.
Analog Outputs Both analog values are directed as current via a 9-pole D-subminiature female con-
nector. The outputs are isolated.
Time
Synchronization
Interface 5 VDC, 12 VDC or 24 VDC time synchronization signals can be processed optionally
if the connections are realized as indicated in Table 8-26.
*) assigned, but not available
Table 8-25 Pin-assignments for the
D-subminiature female connector
of the analog
output
Pin-No. Designation
1 Channel 1 positive
2 –
3 –
4 –
5 Channel 2 positive
6 Channel 1 negative
7 –
8 –
9 Channel 2 negative
Table 8-26 Pin-assignments for the D-subminiature port of the
time synchronization
interface
Pin-No. Designation Signal meaning
1 P24_TSIG Input 24 V
2 P5_TSIG Input 5 V
3 M_TSIG Return Line
4 –*) –*)
5 Screen Shield potential
6 – –
7 P12_TSIG Input 12 V
8 P_TSYNC*) Input 24 V*)
9 Screen Shield potential