Siemens SINUMERIK 840D sl Function Manual page 1608

Data lists
5.2 Signals
5.2.5 Signals to axis/spindle
DB number Byte.Bit
31, ... 1.4
31, ... 1.5 / 1.6
31, ... 2.4 - 2.7
31, ... 4.6 / 4.7
31, ... 12.7
5.2.6 Signals from axis/spindle
DB number Byte.Bit
31, ... 60.4 / 60.5
31, ... 61.3
31, ... 64.6 / 64.7
62
Name
Followup mode (request)
Position measuring system 1 / position measuring system 2
Reference point value 1 to 4
Traversing keys minus / plus
Decelertion of reference point approach
Name
Referenced, synchronized 1 / Referenced, synchronized 2
Followup mode active
Traverse command minus / plus
Basic logic functions: Reference Point Approach (R1)
Function Manual, 11/2006, 6FC5397-0BP10-2BA0