A4: Digital and analog NCK I/Os for SINUMERIK 840D sl
1.2 Access via PLC
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
27
1.2 Access via PLC
1.2.1 Brief description
Configuring NCK I/Os
During commissioning, the number and the hardware assignment of the addressable digital
and analog NCK I/Os and their assignment to NC functions is defined via machine data.
For further information, see "Configuration of the NCK I/Os (Page 28)".
Data exchange
The signals and analog values of the digital and analog I/Os are available in the NC (part
program, ASUB, synchronized action, etc.) in the form of system variables.
• $A_IN [<n>]
Read digital NCK input <n> (where <n> = 1...4 and 9...40)
For further information, see "NCK digital inputs (Page 31)".
• $A_
OUT [<n>]
Read/write digital NCK output <n> (where <n> = 1...4 and 9...40)
For further information, see "NCK digital outputs (Page 32)".
• $A_
INA [<n>]
Read analog NCK input <n> read (where <n> = 1...8)
For further information, see "NCK analog inputs (Page 37)".
• $A_
OUTA [<n>]
Read/write analog NCK output <n> read (where <n> = 1...8)
For further information, see "NCK analog outputs (Page 39)".
<n
> = number of the NCK input/output
Note
When these system variables are read by the part program, a preprocessing stop (STOPRE)
is initiated inside the control.
Comparator inputs
In addition to the digital and analog NCK inputs, 16 internal comparator inputs (comparator
input bytes 1 and 2) are also available.
The signal state of a comparator input is formed by comparing an analog input signal with a
threshold value within a setting data.
For further information, see "Comparator inputs (Page 45)".
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