A4: Digital and analog NCK I/Os for SINUMERIK 840D sl
1.2 Access via PLC
Extended Functions
46 Function Manual, 03/2013, 6FC5397-1BP40-3BA1
Comparator settings
The settings for the individual bits (0 to 7) of comparator byte 1 or 2 are parameterized via
the machine data:
MD10540 $MN_COMPAR_TYPE_1 (parameter assignment for comparator byte 1)
or
MD10541 $MN_COMPAR_TYPE_2 (parameter assignment for comparator byte 2)
The following settings are possible:
● Comparison type mask (bits 0 … 7)
The type of comparison condition is defined for each comparator input bit:
Bit = 1: Associated comparator input bit is set to "1" if:
Analog value ≥ threshold value
Bit = 0: Associated comparator input bit is set to "0" if:
Analog value < threshold value
● Output of the comparator input byte via digital NCK outputs (bits 16 … 23)
The comparator bits can also be output directly via the digital NCK outputs byte-by-byte.
This requires specification in this byte (bits 16 … 23) of the digital NCK output byte to be
used.
Byte = 0: No output via digital NCK outputs
Byte = 1: Output via digital on-board-NCK outputs 9 … 16
Byte = 2: Output via external digital NCK outputs 17 … 24
Byte = 3: Output via external digital NCK outputs 25 … 32
Byte = 4: Output via external digital NCK outputs 33 … 40
● Inversion mask for output of the comparator input byte (bits 24 … 31)
For every comparator signal it is also possible to define whether the signal state to be
output at the digital NCK output is to be inverted or not.
Bit = 1: Associated comparator input bit is not inverted.
Bit = 0: Associated comparator input bit is inverted.
Threshold values
The threshold values used for comparisons on comparator byte 1 or 2 must be stored as
setting data. A separate threshold value must be entered for each comparator input bit <b>
(with <b> = 0 … 7):
SD41600 $SN_COMPAR_THRESHOLD_1[<b>]
or
SD41601 $SN_COMPAR_THRESHOLD_2[<b>]
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