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Interface module
7.4 Interface module SB70
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).
Test socket
The SIMATIC TDC supply voltage is available on the double test socket X5 (G; +):
7.4.1
Signals
Yellow LED
The status of each of the 8 signals (1...8) is displayed by means of a yellow LED.
Terminal block for digital signals
Terminal block X2 provides three screw terminals for each signal to the plant side:
● Terminals 14, 24 ... to 84 for NO contacts
● Terminals 12, 22 ... up to 82 for NC contacts
Terminals 11, 21 ... to 81 as center contact. The corresponding relay contacts are
determined as follows:
Contact closed (NC contact)
Contact open (NO contact)
n: 1...8, depending on the channel number
1)
Note
When wiring the signal voltage to the relay contacts, observe the "Installation and EMC
Directives" chapter in the User Manual.
178
Double test socket X5
+ (1P of X3)
G (1M of X3)
Idle state
Voltage SIMATIC side
+24 V
0 V
Connections (screw terminals)
n2 - n1
1)
n4 - n1
System Manual, 12/2013, A5E01114865-07
SIMATIC TDC hardware
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