4 plc status – Siemens SINUMERIK 840C User Manual
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SINUMERIK 840C (IA)
3.5.4
PLC status
In the “PLC STATUS” mode, the user can read out the contents of counters and
timers and read out and write input words, output words, flag words, data words
and data double words. These words can only be written when a password has
been entered.
Selection
S
Up to software version 2:
SK “Diagnosis” –> SK “NC diagnosis” –> SK “Service display” –> SK “PLC
error recognition”
S
Software version 3 and higher:
SK “Diagnosis” –> SK “Service display” –> SK “PLC service”
IW
QW
FW
DB
DX
C
T
KM
KH
KF
KT
KC
DW
DD
parallel
KH
KF
Data areas
Read
Write
Data number
Input word
x
x
0–126
Output word
x
x
0–126
Flag word
x
x
0–254
Data word
x
x
0–254
Data double word
x
x
0–254
Times
x
–
0–255
Counter
x
–
0–255
Operator entries in
PLC STATUS mode
Any existing byte number may be preselected
Page DOWN:
The byte number is incremented by one
Page UP:
The byte number is decremented by one
3 PLC Installation
3.5.4 PLC status