Siemens SINUMERIK 840D sl Operating Manual page 257

PLC variables
Meters
Data
Formats
B
H
D
+/-D
F
A
Notation for variables
● PLC variables
● NC variables
Note
NC system variables and PLC variables
• System variables can be dependent on the channel. When the channel is switched over,
• For user variables (GUDs) it is not necessary to make a specification according to global
• Using the tooltip, for NC system variables, you can display the OPI notation (with the
Universal
Operating Manual, 03/2010, 6FC5398-6AP10-4BA0
Counter (Cx)
Data block (DBx), data bit (DBXx), data byte (DBBx), data word (DBWx),
data double word (DBDx)
Binary
Hexadecimal
Decimal without sign
Decimal with sign
Floating point (for double words)
ASCII characters
EB2
A1.2
DB2.DBW2
– NC system variables - notation
$AA_IM[1]
– User variables/GUDs - notation
GUD/MyVariable[1,3]
– OPI - notation
/CHANNEL/PARAMETER/R[u1,2]
the values from the corresponding channel are displayed.
or channel-specific GUDs. The indices of GUD arrays are, just like NC variables in the
system variable syntax, 0-based; this means that the first element starts with the index 0.
exception of GUDs).
Alarm, error, and system messages
13.4 PLC and NC variables
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