Siemens SINUMERIK 840D Operating Manual

Alarms, error messages, and system alarms
20.4 PLC and NC variables
Milling
Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
583
PLC variables
Inputs Input bit (Ex), input byte (EBx), input word (EWx), input double word (EDx)
Outputs Output bit (Ax), output byte (ABx), output word (AWx), output double word
(ADx)
Bit memory Memory bit (Mx), memory byte (MBx), memory word (MWx), memory
double word (MDx)
Times Time (Tx)
Meters Counter (Cx)
Data Data block (DBx), data bit (DBXx), data byte (DBBx), data word (DBWx),
data double word (DBDx)
Formats
B Binary
H Hexadecimal
D Decimal without sign
+/-D Decimal with sign
F Floating point (for double words)
A ASCII characters
Notation for variables
● PLC variables
EB2
A1.2
DB2.DBW2
● NC variables
– NC system variables - notation
$AA_IM[1]
– User variables/GUDs - notation
GUD/MyVariable[1,3]
– OPI - notation
/CHANNEL/PARAMETER/R[u1,2]

Siemens SINUMERIK 840D Specifications

General

Series	SINUMERIK 840D
Axes	Up to 31
Channels	Up to 10
Operating System	Windows-based
Power Supply	24 V DC
Control Unit Type	CNC
Interface	Ethernet, PROFIBUS
Display	TFT color display
Interpolation	Spline
PLC	Integrated PLC
Data Storage	CompactFlash, USB