Siemens 6SL3845-7NN46-7AA2 Operating Instructions & Installation Instructions page 134

Operation
8.6 Fault and system messages
r4047 TM15 digital outputs status
Display of the digital output status on the Terminal Module 15 (TM15)
Bit Signal name
14 DI/DO 14 (X521.8)
15 DI/DO 15 (X521.9)
16 DI/DO 16 (X522.2)
17 DI/DO 17 (X522.3)
18 DI/DO 18 (X522.4)
19 DI/DO 19 (X522.5)
20 DI/DO 20 (X522.6)
21 DI/DO 21 (X522.7)
22 DI/DO 22 (X522.8)
23 DI/DO 23 (X522.9)
It does matter whether DI/DO is set as an input or output (p4028).
DI/DO: Bidirectional digital input/output
134
0-signal
Low
Low
Low
Low
Low
Low
Low
Low
Low
Low
SINAMICS SM150 6SL3845-7NN46-7AA2
Operating Instructions Rev.201910281345 EXAMPLE
1-signal
High
High
High
High
High
High
High
High
High
High