Monitoring Status (Gud); Plc Interface For Axis-Specific Braking Operations - Siemens SINUMERIK 840D sl Function Manual

21.3.11

Monitoring status (GUD)

The actual status of one axis pair is displayed using the global user variable
_PROTECT_STATUS. The system variable is not available as standard default setting. When
required, it must be defined in the GUD.DEF definition window.
Definition
DEF NCK INT _PROTECT_STATUS[<number of parameterized axis pairs> ]
with <number of parameterized axis pairs> = 1, 2, ... (maximum number of axis pairs
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Range of values
Value
0
1
2
3
4
21.3.12

PLC interface for axis-specific braking operations

Using the following machine data, within the general system variable field $A_DBD, a double
word (four bytes) can be defined as axis-specific interface to the PLC. When the axes of the
axis pair approach one another, the braking of the machine axes is displayed via this interface.
$MN_CC_PROTECT_A_DBD_INDEX = <value>
<value> Meaning
≥ 0
Note
Double word index
The starting index can be specified in the machine data, byte-by-byte (0, 1, 2, ...). System
variable $A_DBD is accessed from the PLC using a double word. This means that a starting
index, which is not located at a double word boundary (0, 4, 8, ...), is rounded off to the next
double word boundary: Index = (index DIV 4) * 4
Examples: 3 ⇒ 0; 5 ⇒ 4; 10 ⇒ 8;
Interface
Each interface bit is assigned a machine axis:
Special functions
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
Meaning: The monitoring of the axis pair is ...
Not active
selected, but not yet active
active, the axes are currently not being braked
active, the axes are currently being braked
deselected, however still active
-1 Deactivation of the output.
Starting index of the interface within the system variable field $A_DBD in byte (0, 1, 2, ... )
TE9: Axis pair collision protection
21.3 Startup
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