Interface module
7.6 Interface modules SU12 und SU13
SIMATIC TDC hardware
212
System Manual, 08/2017, A5E01114865-AL
7.6.1
Function description
Interface modules SU12 and SU13 are used to wire a ribbon cable connector X1 on
SIMATIC TDC side 1:1 to the terminal blocks X2 on plant side, with the exception of the
following terminals.
The following signal lines are fused at the terminals (0.5 A slow-blow, internal resistance
0.25 Ω):
Interface module
Terminal block X2
SU12
Pin 1 – 8
SU13
Pin 8, 17 – 23, 26 – 33, 36 – 43, 46 – 48
The following terminals have a protective diode (Schottky diode type Vishay BAT46) for the
24 V supply voltage of digital outputs in the following signal lines:
Interface module
Terminal block X2
SU12
Pin 10
SU13
Pin 10
A PTC resistor (internal resistance: 0.9 Ω, e.g. type Epcos B59910
-C120-A70) element is
installed at the following terminals for short-circuit protection of the 24 V supply voltage of
digital outputs in the signal line:
Interface module
Terminal block X2
SU12
Pin 9
SU13
Pin 9
Process signals
The concept of the interface modules support signal flow on both sides. The process signals
are transferred without additional electrical isolation and signal preparation.
Table 7- 7
Maximum permissible voltage and current values for signal processing
Voltage range
The maximum permitted voltages of the modules to
which the interface modules are connected must be
maintained.
Current range
Max. 0.5 A
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