Siemens SINAMICS S110 Manual page 76

Blocksize Power Modules (PM240-2)
4.3 Interface description
Figure 4-5 PM240-2, frame size FSE (view from below and front)
Note
Use of the safety function "STO" via PM terminals with SINAMICS S110
With enabled Safety Integrated functions of the CU305, a simultaneously active STO
function via PM terminals causes error messages to be output (see Chapter STO connection
via PM terminals (Page 82)).
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SINAMICS S110
Manual, 07/2015, 6SL3097-4AC10-0BP5