Siemens SIMATIC Ident Function Manual page 107

Command repetition
The procedure for command repetition and its advantages were described earlier in the
section "Command repetition (Page 37)".
Programming of command repetition at the PN/PB level is described below. Command
repetition is controlled by the I/O input or output word (see section "Cyclic control word
between master and communications module (Page 102)").
The following diagram shows frame exchange between user (PN/PB master) and CM:
Figure B-8
Command repetition can also be concretely controlled as shown below.
● An external proximity switch is used to signal that a new tag is entering the transmission
● A new tag is detected with the ANZ_MDS_present_ bit, and command repetition is then
FB 45 for MOBY U, MOBY D, RF200, RF300
Function Manual, 07/2012, J31069-D0166-U001-A4-7618
Command repetition using I/O words
window (see figure below: Ⓐ).
started (see figure below: Ⓑ).
Programming communications modules
B.3 Methods of operation with the communications module
107