Siemens SINUMERIK 840D sl Function Manual page 861

Figure 13-12 M decoding acc. to list
Activation
M decoding is activated using FB1 parameter "ListMDecGrp"
The number of M groups to the evaluated and/or decoded is specified using the appropriate
parameter. The function is active for a parameter value = 1 ... 16.
●
" FB1: RUN_UP - basic program, start section (Page 914) ").
Properties and structure of the decoding list (DB75)
Properties of the decoding list (DB75):
● There is only one decoding list independent of the channel.
● The decoding list can include a maximum of 16 groups.
● A group has a maximum of 16 signals
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
Basic program, OB100, FB1 parameter ListMDecGrp = <number of M groups> (also see
P3: Basic PLC program for SINUMERIK 840D sl
13.10 Structure and functions of the basic program
861