Siemens SINUMERIK 840D sl Function Manual page 492

Data descriptions
9.6 Interface signals
DB18
DBW216
DBW218
DB18
Data block
Byte Bit 7
DBW448
DBB450
DBB451
DBB452
DBB454
DBW456
DBW448
DBB450
DBB451
DBW452
DBW454
DBW456
...
DBW568
DBB570
DBB571
DBW572
492
Bit 6 Bit 5
F_SENDDP 1...3
FSDP[3].RETVAL14
FSDP[3].RETVAL15
F_SENDDP 4...16
PLC → NCK interface
Bit 4 Bit 3
FSDP HF[4].ERR_REAC
FSDP_HF[4].DIAG
FSDP_HF[4].RETVAL14
FSDP_HF[4].RETVAL15
FSDP HF[5].ERR_REAC
FSDP_HF[5].DIAG
FSDP_HF[5].RETVAL14
FSDP_HF[5].RETVAL15
...
FSDP_HF[16].ERR_REAC
FSDP_HF[16].DIAG
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Bit 2 Bit 1
FSDP
HF[4].
SUBS_ON
FSDP
HF[5].
SUBS_ON
FSDP
HF[16].
SUBS_ON
Bit 0
FSD HF[4].
ERROR
FSDP
HF[5].
ERROR
FSDP
HF[16].
ERROR
Safety Integrated