Siemens SIMATIC Ident Function Manual page 103

Cyclic word from communications module: I/O input
Figure B-3
After startup, the "cyclic word from the CM" appears as follows in sequence (bits 8 to 15 are
shown):
FB 45 for MOBY U, MOBY D, RF200, RF300
Function Manual, 07/2012, J31069-D0166-U001-A4-7618
B.2 Cyclic control word between master and communications module
Structure of the cyclic control word: Peripheral input
Programming communications modules
103