Direct I/O Access Via Plc; Parameterization - Siemens SINUMERIK 840D sl Function Manual

A4: Digital and analog NC I/O for SINUMERIK 840D sl

2.3 Direct I/O access via PLC

2.3 Direct I/O access via PLC
2.3.1

Parameterization

Machine data
Length of the I/O ranges
● Number of PLC I/O input bytes that are read directly by the NC:
MD10394 $MN_PLCIO_NUM_BYTES_IN
● Number of PLC I/O output bytes that are written directly by the NC:
MD10396 $MN_PLCIO_NUM_BYTES_OUT
Logical start addresses
● Logical start address as of which the data is read from the PLC input I/O. The offset used
for the subsequent addressing, e.g. $A_PBB_IN[< offset >] refers to the start address
specified in the machine data:
MD10395 $MN_PLCIO_LOGIC_ADDRESS_IN
● Logical start address as of which the data is written to the PLC input I/O. The offset used
for the subsequent addressing, e.g. $A_PBB_OUT[< offset >] refers to the start address
specified in the machine data:
MD10397 $MN_PLCIO_LOGIC_ADDRESS_OUT
Update time
● Time within which the data that can be read by means of $A_PBx_IN is updated (see
Subsection "Transfer times" below).
MD10398 $MN_PLCIO_IN_UPDATE_TIME
Format display
● Format display of system variables $A_PBx_OUT and $A_PBx_IN (see Subsection
"Selection of the storage format (little/big endian)" below).
MD10399 $MN_PLCIO_TYPE_REPRESENTATION
Note
The logical PLC I/O addresses entered in the machine data and the number of bytes to be
transferred must be consistent with the PLC hardware configuration. In the configured areas,
there must not be any "address gaps" in the PLC I/O expanded configuration.
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Function Manual, 10/2015, 6FC5397-1BP40-5BA3
Extended Functions