Comparator Inputs - Siemens SINUMERIK 840D sl Function Manual
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1.2.7
Comparator inputs
Function
Two internal comparator inputs bytes (with eight comparator inputs each) are available in
addition to the digital and analog NCK inputs. The signal state of the comparator inputs is
generated on the basis of a comparison between the analog values present at the fast
analog inputs and the threshold values parameterized in setting data (see fig.).
The $A_INCO[n] system variable allows the signal state (i.e. the result of the comparison) of
comparator input [n] to be scanned directly in the part program.
Applies to index n:
n = 1 to 8
n = 9 to 16
Terms
In this description, the terms "comparator inputs" (with index [n]; range of n: 1 to 8 or 9 to 16)
and "comparator input bits" (with index [b]; range of b: 0 to 7) are used.
They are related as follows:
For n = 1 to 8:
For n = 9 to 16:
Example
Comparator input 1 is equivalent to comparator input bit 0.
Assignment of analog inputs
The following general machine data is used to assign an analog input to input bit [b] of
comparator byte 1.
MD10530 $MN_COMPAR_ASSIGN_ANA_INPUT_1[b]
Extended Functions
Function Manual, 03/2009, 6FC5397-1BP10-4BA0
For comparator byte 1
For comparator byte 2
Comparator input n is equivalent to comparator input bit b = n - 1.
Comparator input n is equivalent to comparator input bit b = n -9.
Digital and Analog NCK I/Os (A4)
NCK I/O via PLC
53
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