System Variables; Comparator Inputs; Digital Nc I/Os; Digital Inputs - Siemens SINUMERIK 840D sl Function Manual
Extended functions
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Also See for SINUMERIK 840D sl:
- Function manual (2184 pages) ,
- Programming manual (1334 pages) ,
- Commissioning manual (1102 pages)
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A4: Digital and analog NC I/O for SINUMERIK 840D sl
2.2 Indirect I/O access via PLC
2.2.3
System variables
Input data
System variable
$A_IN[ <n> ]
$A_INA [<n>]
A preprocessing stop is triggered in the channel when reading input data from a part program.
Output data
System variable
$A_OUT [<n>]
$A_OUTA [<n>]
A preprocessing stop is triggered in the channel when reading output data from a part program.
2.2.4
Comparator inputs
In addition to the I/O inputs, 16 control-internal comparator inputs are available.
The current signal state of a comparator input results from the comparison of an analog I/O
input with a threshold value specified in the setting data.
See "Comparator inputs (Page 49)".
2.2.5
Digital NC I/Os
2.2.5.1
Digital inputs
Function
The workpiece-machining program sequence can be controlled by external signals via digital
NC inputs.
The signal state of digital input <n> can be scanned directly in the part program using system
variable $A_IN [<n>].
The signal state at the hardware input can be changed from the PLC user program.
Applications
Digital NC inputs are used, for example, for the following NC functions:
● Delete distance-to-go with positioning axes
● Fast program branching at the end of block
34
Index or input number <n>
1 ... 4 and 9 ... 40, see Digital inputs (Page 34)
1 ... 8, see Analog inputs (Page 41)
Index or output number <n>
1 ... 4 and 9 ... 40, see Digital outputs (Page 36)
1 ... 8, see Analog outputs (Page 44)
Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Extended Functions
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