Interface module
7.5 Interface module SB71
SIMATIC TDC hardware
System Manual, 08/2017, A5E01114865-AL
205
Green LED
The voltage supply on SIMATIC TDC side is indicated by a green LED (P).
Red LED
The supply voltage on SIMATIC TDC side (1P, 1M) is short-circuited (fault).
Voltage supply on plant side
The 24/48 V DC power supply voltage for signals on plant side is wired to terminal block X4:
Terminal X4
Voltage on plant side
2P
2M
+24/48 V
0 V
Connect the cables using accessory kit SM11 "Power supply connector for interface
modules" (article number: 6DD1680-0BB0)
The maximum conductor cross-section at terminal X4 is 2.5 mm².
Test socket
The SIMATIC TDC supply voltage is available on the double test socket X5 (G; +):
Double test socket X5
Voltage SIMATIC side
+ (1P of X3)
G (1M of X3)
+24 V
0 V
WARNING
Explosion hazard
It is not allowed to use the X5 test sockets in potentially explosive environments.
Note
When wiring the supply voltage, observe the “Installation and EMC Directives” chapter in the
User Manual.
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