Terminal And Block Diagram Of The Digital On-Board I/O - Siemens Simatic S7-1500 CPU 1512C-1 PN User Manual

Wiring
4.3 Terminal and block diagrams
4.3.3

Terminal and block diagram of the digital on-board I/O

This section contains the block diagram of the digital on-board I/O (X11 and X12) with
standard inputs and outputs and the encoder supply, as well as the rules for the correct
wiring of the ground connections.
For information on wiring the front connector, establishing the cable shield, etc., refer to the
S7-1500, ET 200MP (http://support.automation.siemens.com/WW/view/en/59191792)
system manual.
Infeed element
The infeed element is inserted on the front connector and serves to shield the digital on-
board I/O.
Note
The digital on-board I/O is supplied via the front connector terminals and therefore does not
require power to be supplied by the infeed element. The infeed element is, however,
necessary for shielding.
Output driver
The digital onboard I/O uses the following output drivers:
● X11, DQ0 to DQ7: Push-pull stage and freewheeling diode
● X11, DQ8 to DQ15: High-side switch and freewheeling diode
● X12 DQ0 to DQ7: High-side switch without freewheeling diode
● X12 DQ8 to DQ15: High-side switch without freewheeling diode
90
CPU 1512C-1 PN (6ES7512-1CK01-0AB0)
Manual, 12/2017, A5E40898741-AA