Siemens SIPROTEC 4 7VK61 Manual page 204

Mounting and Commissioning
3.2 Checking Connections
•
CTS = Clear to send
•
GND = Signal / Chassis Ground
The cable shield is to be earthed at both line ends. For extremely EMC-prone environments, the earth may be
connected via a separate individually shielded wire pair to improve immunity to interference.
Table 3-20
Pin No. Operator
interface
1
2 RxD
3 TxD
4 -
5 GND
6 -
7 RTS
8 CTS
9 -
1) Pin 7 also carries the RTS signal with RS232 level when operated as RS485 Interface. Pin 7 must therefore
not be connected!
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' (GND). Make sure that only the terminating resistors at the last device on the bus are connected,
but not for all other devices on the bus. The jumpers for the terminating resistors are on the interface module
(see Figure 3-12
tors can also be connected externally (e.g. to the terminal block, see
resistors located on the module must be disabled.
If the bus is extended, make sure again that only the terminating resistors at the last device on the bus are
connected.
Time Synchronization Interface
It is optionally possible to process 5 V, 12 V or 24 V time synchronization signals, provided that these are
connected to the inputs named in the following table.
Table 3-21
Pin No. Description
1 P24_TSIG
2 P5_TSIG
3 M_TSIG
4
-
5 SHIELD
6 -
7 P12_TSIG
8
P_TSYNC
9 SHIELD
1) Assigned, but cannot be used
204
The assignments of the D-subminiature and RJ45 connector for the various interfaces
RS232 RS485
Shield (with shield ends electrically connected)
RxD -
TxD A/A' (RxD/TxD-N)
- -
GND C/C' (GND)
- -
RTS
- 1)
CTS B/B' (RxD/TxD-P)
- -
or Figure 3-13) of directly on the C-CPU-2 (see
D-subminiature connector assignment of the time synchronization interface
1)
1)
PROFIBUS FMS Slave, RS485
PROFIBUS DP Slave, RS485
-
B/B' (RxD/TxD-P)
CNTR-A (TTL)
C/C' (GND)
+5 V (max. load < 100 mA)
-
A/A' (RxD/TxD-N)
-
Figure 3-5
Figure
Signal meaning
Input 24 V
Input 5 V
Return line
- 1)
Shield potential
-
Input 12 V
Input 24 V 1)
Shield potential
DNP3.0 RS485 Ethernet
-
A
RTS (TTL level)
GND1
VCC1
-
B
- Non Exis-
and Table 3-7). Terminating resis-
3-6). In this case, the terminating
SIPROTEC 4, 7VK61, Manual
C53000-G1176-C159-5, Edition 05.2018
EN 100
Tx+
Tx-
Rx+
-
-
Rx-
-
-
tent