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
45
1.2.5 Comparator inputs
Function
Two internal comparator input bytes, each with eight comparator inputs, 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.
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 for index <n>:
<n> = 1 ... 8 For comparator byte 1
<n> = 9 ... 16 For comparator byte 2
Terms
The terms comparator inputs (with index <n>; value range from <n>: 1 ... 8 or 9 ... 16) and
comparator input bits (with index <b>; value range from <b>: 0 ... 7) are used in this
description.
They are related as follows:
For <n> = 1 ... 8: Comparator input <n> is equivalent to comparator input bit
<b> = <n> - 1.
For <n> = 9 ... 16: Comparator input <n> is equivalent to comparator input bit
<b> = <n> - 9.
Example: Comparator input 1 is equivalent to comparator input bit 0.
Assignment of the analog inputs
The following 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>]
Example:
MD10530 $MN_COMPAR_ASSIGN_ANA_INPUT_1[0] = 1
MD10530 $MN_COMPAR_ASSIGN_ANA_INPUT_1[1] = 1
MD10530 $MN_COMPAR_ASSIGN_ANA_INPUT_1[7] = 7
Analog input 1 acts on input bits 0 and 1 of comparator byte 1.
Analog input 7 acts on input bit 7 of comparator byte 1.
The analog inputs for comparator byte 2 are assigned with the machine data:
MD10531 $MN_COMPAR_ASSIGN_ANA_INPUT_2[<b>]
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