Siemens SIPROTEC 4 7UT6 Series Manual page 327

The input/output board C-I/O-1 is only available in the versions 7UT633 and 7UT635.
[ein-ausgabebgr-c-io-1-040403-st, 1, en_GB]
Figure 3-9
For 7UT633 and 7UT635 as from release EE, a further C-I/O-1 or C-I/O-10 can be available at slot 33
(depending on the version).
SIPROTEC 4, 7UT6x, Manual
C53000-G1176-C230-5, Edition 09.2016
C-I/O-1 input/output boards with representation of jumper settings required for checking
configuration settings
Mounting and Commissioning
3.1 Mounting and Connections
327