Interface module
7.4 Interface module SB70
SIMATIC TDC hardware
System Manual, 08/2017, A5E01114865-AL
199
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:
Idle state
Connections (screw terminals)
Contact closed (NC contact)
Contact open (NO contact)
n2 - n1
1)
n4 - n1
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.
Aotewell Ltd
www.aotewell.com
Industry Automation
HongKong|UK|China
+86-755-8660-6182