Siemens siprotec SJ62, Руководство пользователя

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3.2 Checking Connections
416
SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
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 is to be grounded at both ends . For extremely EMC-prone environ-
ments, the GND may be connected via a separate individually shielded wire pair to
improve immunity to interference.
Additional Interface
(only 7SJ64) The additional interface available only for 7SJ64 (port D) serves for signal injection of
one or two RTD-boxes. The connection is performed according to one of the connec-
tion examples given in the Appendix A.3.
Table 3-35 Assignments of the connectors to the various interfaces
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 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 on the interface module RS485 (see
Figure 3-22) or on the Profibus RS485 (see Figure 3-24) or with the 7SJ64 directly on
the C–CPU-2 (see Figure 3-16 and Table 3-23). The terminating resistors can also be
connected externally (e.g. to the connection module as illustrated in Figure 3-17). In
this case, the terminating resistors located on the module must be disconnected.
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.
Time Synchroniza-
tion Interface It is optionally possible to process 5 V-, 12 V- or 24 V- time synchronization signals,
provided that they are carried to the inputs named in the following table.
Pin No. RS232 RS485 PROFIBUS FMS Slave,
RS485
Modbus RS485 Ethernet
EN 100
PROFIBUS FMS Slave,
RS485
DNP3.0 RS485
1 Shield (with shield ends electrically connected) Tx+
2 RxD – – – Tx–
3 TxD A/A’ (RxD/TxD-N) B/B’ (RxD/TxD-P) A Rx+
4 – – CNTR-A (TTL) RTS (TTL level) —
5 GND C/C’ (GND) C/C’ (GND) GND1 —
6 – – +5 V (max. load < 100 mA) VCC1 Rx–
7 RTS –
1)
– – —
8 CTS B/B’ (RxD/TxD-P) A/A’ (RxD/TxD-N) B —
9 – – – – not available