A4: Digital and analog NCK I/Os for SINUMERIK 840D sl
1.3 Access via PROFIBUS
Extended Functions
56 Function Manual, 03/2013, 6FC5397-1BP40-3BA1
1.3.2 Configuration of the I/O ranges
The configuration of the I/O range is performed via the machine data. The parameters once
set can no longer be changed during the normal operation of the NCK.
16 I/O ranges in the read direction and 16 I/O ranges in the write direction are provided. NCK
restricts the maximum size of the I/O ranges to 128 bytes each.
Once an I/O range is activated, its availability is checked each time an IPO cycle starts. For
this, the sign of life of a user data slot within an I/O range is evaluated. If the sign of life is not
set at the start of an IPO cycle, an alarm (9050 or 9052) is issued. This alarm does not stop
the processing of the part program, but instead is only displayed and remains as such till the
affected I/O range gets a valid sign of life again.
Logical start address
To make specific I/O ranges available again, their logical start addresses must be conveyed
to the NCK. The following machine data must be set:
MD10500 $MN_DPIO_LOGIC_ADDRESS_IN[<n>]
MD10510 $MN_DPIO_LOGIC_ADDRESS_OUT[<n>]
<n> = index for the I/O range
Length of an I/O range
In order that the NCK can check, whether an I/O range has been configured completely, the
expected length (bytes) of the corresponding I/O range must be entered. The following
machine data must be set:
MD10501 $MN_DPIO_RANGE_LENGTH_IN[<n>]
MD10511 $MN_DPIO_RANGE_LENGTH_OUT[<n>]
If the length "0" is entered, only the user data slot found under the corresponding logical start
address is configured as I/O range. In such a case, the length of the I/O range is then
compared to the length of the user data slot found.
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