Siemens SINUMERIK 840D sl Function Manual page 50

A4: Digital and analog NCK I/Os
1.2 NCK I/O via PLC
Variable-value ranges
Values within the following ranges can be stored in the variables:
$A_PBB_OUT[n]
$A_PBW_OUT[n]
$A_PBD_OUT[n]
$A_PBR_OUT[n]
Transfer times
Data is output from NCK ⇒ PLC (write) at the end of the interpolation cycle if at least one
data was written.
Data is read in by transmitting a request at the end of the interpolation cycle, as a function of
machine data.
MD10398 $MN_PLCIO_IN_UPDATE_TIME
The new data are available in the subsequent interpolation cycle at the earliest.
The time period within which a request is sent to the PLC can be set, using the following
machine data.
MD10398 $MN_PLCIO_IN_UPDATE_TIME
The entered time period is rounded up internally to the next highest multiple of an
interpolation cycle. If the value of these machine data is set to 0, the request will continue to
be sent to the PLC in every interpolation cycle.
Configuring
To activate the functionality, the following machine data (Power ON active) must be
configured on the NC:
MD10394 $MN_PLCIO_NUM_BYTES_IN
MD10395 $MN_PLCIO_LOGIC_ADDRESS_IN
MD10396 $MN_PLCIO_NUM_BYTES_OUT
MD10397 $MN_PLCIO_LOGIC_ADDRESS_OUT
MD10398 $MN_PLCIO_IN_UPDATE_TIME
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Number of PLC-I/O input bytes that are read directly by the NC
Logical start address of the PLC input I/O, starting at which the data are read
Number of PLC I/O output bytes that are written directly by the NC
Logical start address of the PLC output I/O, starting at which the data are written
Time period within which the data that can be read by means of $A_PBx_IN are
updated. The time period is rounded up internally to the next highest multiple of the time
defined by the interpolation cycle. When 0 is entered (default value), the data are
updated in every interpolation cycle.
;(-128 ... +127) or (0 ... 255)
;(-32768 ... +32767) or (0 ... 65535)
;(-2147483648 ... +2147483647) or (0 ... 4294967295)
;(-3.402823466E+38 ... +3.402823466E+38)
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
Extended Functions