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Module design
● The enclosure is suitable for snap-on mounting to rails
● Ribbon cable connector (X1):
● Connector (X2), 2x 8-pole
● 1 terminal pair X3: 1P and 1M (voltage supply on SIMATIC TDC side)
● 1 terminal pair X4: 2P, 2M (voltage supply on plant side)
● Double test socket X5: 1P(+), 1M(G)
● LED displays for diagnostics
● Optocoupler for electrical isolation between inputs and outputs
Voltage supply on SIMATIC side
The SIMATIC TDC voltage supply is fed to terminal X3:
Connect the cables using accessory kit SM11 "Power supply connector for interface
modules" (MLFB: 6DD1680-0BB0)
The maximum conductor cross-section at terminal X3 is 2.5 mm².
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).
SIMATIC TDC hardware
System Manual, 12/2013, A5E01114865-07
– 8 pins for digital inputs
– 2 pins for 1P, 1M
– 8 terminals for digital outputs, 24/48 V DC
– 8 terminals for reference potentials
Terminal X3
1P
1M
7.5 Interface module SB71
Voltage on SIMATIC TDC side
+24 V
0 V
Interface module
183
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