Siemens SIMATIC Manual page 532

Parameter sets of signal modules
A.5 Settings from the digital output module SM 322; DO 16 x DC 24 V/0.5 A (6ES7322-8BH10-0AB0)
Figure A-4
Note
The "hold last valid value" and "set substitute value" parameters should only be enabled at
byte 0 as an alternative.
532
Structure of data record 1
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ