Siemens SIPROTEC 7UM62 User Manual

Mounting and Commissioning
3.2 Checking Connections
SIPROTEC, 7UM62, Manual
C53000-G1176-C149-7, Release date 03.2010
391
3.2.2 System Interface
For versions equipped with a serial interface to a control center, the user must check the data connection. The
visual check of the assignment of the transmission and reception channels is of particular importance. With
RS232 and fibre optic interfaces, each connection is dedicated to one transmission direction. Therefore the
output of one device must be connected to the input of the other device and vice versa.
With data cables, the connections are designated according to DIN 66020 and ISO 2110:
• TxD = Data Output
• RxD = Data Input
•RTS = Request to Send
•CTS
= Clear to Send
• GND = Signal / Chassis Ground
The cable shield has to be earthed at both line ends. For extremely EMC-loaded environments the GND may
be integrated into a separate individually shielded wire pair to improve the immunity to interference.
Table 3-24 The assignments of the D-subminiature and RJ45 connector for the various interfaces
1)
Pin 7 also carries the RTS signal with RS232 level when operated as RS485 Interface. Pin 7 may therefore
not be connected!
3.2.3 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). 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 located on the interface
module RS485 (see Figure 3-10) or on the PROFIBUS module RS485 (see Figure 3-11). The terminating re-
sistors can also be connected externally (e.g. to the connection module as illustrated in Figure 3-4). In this case,
the terminating resistors located on the module must be disabled.
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.
Pin
No.
Operator in-
terface
RS232 RS 485 Profibus DP Slave,
RS 485
DNP3.0 Modbus,
RS485
Ethernet
EN100
1 Shield (with shield ends electrically connected) Tx+
2 RxD RxD – – – Tx-
3 TxD TxD A/A’ (RxD/TxD-N) B/B’ (RxD/TxD-P) A Rx+
4 – – – CNTRA-(TTL) RTS (TTL level) –
5 GROUND EARTH C/C' (EARTH) C/C' (EARTH) EARTH1 –
6 – – – +5 V (max. load < 100
mA)
VCC1 Rx-
7RTS
RTS –
1)
–––
8CTS
CTS B/B’ (RxD/TxD-P) A/A’ (RxD/TxD-N) B –
9 – – – – – Disabled

Siemens SIPROTEC 7UM62 Specifications

General

Brand	Siemens
Model	SIPROTEC 7UM62
Category	Protection Device
Language	English