Interface module
7.4 Interface module SB70
SIMATIC TDC hardware
System Manual, 08/2017, A5E01114865-AL
199
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:
Connections (screw terminals)
Contact closed (NC contact)
Contact open (NO contact)
n2 - n1
1)
1)
n: 1...8, depending on the channel number
Note
When wiring the signal voltage to the relay contacts, observe the “Installation and EMC
Directives” chapter in the User Manual.
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