Siemens Plant Central Clock TC100 - Manual (Page 21)

Hardware description
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SICLOCK ® TC100 Operating Instructions
3.2 Connection elements
The following figure shows the connectors on the SICLOCK TC100.
Figure 3-2 SICLOCK TC100 - layout of connectors
(1) Terminal X1 - 24V supply voltage
(2) Terminal X2 - connecting terminal for radio clocks, outputs and alarm
See also Terminal assignment (Chapter 15.1).
(3) Ethernet port