Control By The Plc - Siemens SINUMERIK 840D sl Function Manual

11.7

Control by the PLC

11.7
PLC axes
PLC axes are traversed from the PLC and can move asynchronously to all other axes. The
travel motions are executed separate from the path and synchronized actions.
Reference:
Function Manual Basic Functions; "Basic PLC Program for SINUMERIK 840D sl" (P3) or
"PLC for SINUMERIK 828D" (P4)
Concurrent positioning axes
Using function block FC18, for SINUMERIK 840D sl concurrent positioning axes can be
started from the PLC.
Channel-specific signals
All channel-specific signals act to the same extent on path and positioning axes.
Only the following signals are an exception:
● IS DB21, ... DBB4 ("Feedrate override")
● IS DB21, ... DBX6.2 ("Delete distance to go")
Axis-specific signals
Positioning axes have the following additional signals:
● IS DB31, ... DBX76.5 ("Positioning axis")
● Feedrate for positioning axes/spindles (FA)
● IS DB31, ... DBB0 ("Feedrate override") axis-specific
● IS DB31, ... DBX2.2 ("Distance to go/Spindle reset") Axis-specific deletion of distance to go
Single-axis functions of PLC-controlled axes
The behavior of individual PLC axes can be manipulated in the following way with machine
data:
MD30460 $MA_BASE_FUNCTION_MASK:
● Bit 4 = 1
● Bit 5 = 1
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
The axis is exclusively controlled by the PLC.
The axis is a permanently assigned PLC axis.
P2: Positioning axes
11.7 Control by the PLC
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