3.2 Checking Connections
397
7SA522 Manual
C53000-G1176-C155-3
Table 3-12 The assignments of the subminiature connector for 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!
Ter m in ati on 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). It is necessary to check that the termi-
nating resistors are connected to the bus only at the last unit, and not at all the other
devices on the bus. The jumpers for the terminating resistors are located on the inter-
face module RS485 (see Figure 3-9) or on the Profibus module RS485 (see Figure 3-
10). The terminating resistors can also be connected externally (e.g. to the connection
module) as illustrated in Figure 3-12. In this case, the terminating resistors located on
the module must be disconnected.
If the bus is extended, make sure again that only terminating resistors at the last
device to the bus are switched in. The remaining terminating resistors at the bus must
not be connected to the system.
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 3-13 D-subminiature connector assignment of the time synchronization interface
1)
Assigned, but cannot be used
Pin No. Operator in-
terface
RS232 RS 485 PROFIBUS FMS Slave, RS
485
DNP3.0 RS485
PROFIBUS DP Slave, RS 485
1 Shield (with shield ends electrically connected)
2RxDRxD - - -
3 TxD TxD A/A' (RxD/TxD-N) B/B' (RxD/TxD-P) A
4 - - - CNTR-A (TTL) RTS (TTL level)
5 GROUND GROUND C/C’ (GROUND) C/C’ (GROUND) GROUND1
6 - - - +5 V (max. load 100 mA) VCC1
7RTS
RTS -
1)
--
8CTS
CTS B/B' (RxD/TxD-P) A/A' (RxD/TxD-N) B
9- - - - -
Pin No. Designation Signal meaning
1 P24_TSIG Input 24 V
2 P5_TSIG Input 5 V
3 M_TSIG Return line
4-
1)
-
1)
5 SHIELD Shield potential
6- -
7 P12_TSIG Input 12 V
8 P_TSYNC
1)
Input 24 V
1)
9 SHIELD Shield potential
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