Siemens SIPROTEC 4 7VE61 Manual page 164

Mounting and Commissioning
3.2 Checking Connections
•
CTS = Clear to send
•
GND = Signal/Chassis Ground
The cable shield is to be grounded at both ends. For extremely EMC-prone environments, the GND may be
connected via a separate individually shielded wire pair to improve immunity to interference.
Table 3-16
Pin-No. RS232
1
2 RxD
3 TxD A/A' (RxD/TxD-N)
4 –
5 GND C/C' (GND)
6 –
7 RTS
8 CTS B/B' (RxD/TxD-P)
9 –
1) Pin 7 also carries the RTS signal with RS232 level when operated as RS485 Interface. Pin 7 must therefore not be
connected
Termination
The RS485 interface is capable of half-duplex operation with signals A/A' and B/B' with the common reference
potential C/C' (EARTH). 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 (see
Figure 3-4 and Table
module as illustrated in
bled.
If the bus is extended, make sure again that only the last device on the bus has the terminating resistors
enabled, and that all other devices on the bus do not.
Analog Output
The two analog values are output as currents on a 9-pin DSUB socket. The outputs are isolated.
The cable shield is to be grounded at both ends. For extremely EMC environments, the GND may be
connected via a separate individually shielded wire pair to improve immunity to interference.
Table 3-17
Pin-No. Code
1 Channel 1 positive
2 –
3 –
4 –
5 Channel 2 positive
6 Channel 1 negative
7 –
8 –
9 Channel 2 negative
164
Assignment of the connectors for the various serial interfaces
RS485 Profibus FMS Slave, RS485
Profibus DP Slave, RS485
Shield (with shield ends electrically connected)
–
B/B' (RxD/TxD-P)
– CNTR-A (TTL)
C/C' (GND)
– +5 V (max. load <100 mA)
– 1)
A/A' (RxD/TxD-N)
–
Figure 3-9) or on the Profibus RS485 (see
3-7). The terminating resistors can also be connected externally (e.g. to the connection
Figure 3-5). In this case, the terminating resistors located on the module must be disa-
Pin assignment of DSUB socket for analog output
Modbus RS485
DNP 3.0 RS485
– –
A
RTS (TTL level)
GND1
VCC1
– –
B
– –
Figure 3-10). or directly on the C–CPU–2 (see
EN 100 electr.
RJ45
Tx+
Tx–
Rx+
–
–
Rx–
–
–
not available
SIPROTEC 4, 7VE61 and 7VE63, Manual
C53000-G1176-C163-3, Edition 10.2017