Variable Paths For Machine And Setting Data; Variable Paths For 1:N Configuration (Only Target System Pcu) - Siemens SINUMERIK 840Dsl Configuration Manual

Functionality
5.3 Variable access
Variable path
/Plc/DB8.DBB2:STRING
/Plc/DB8.DBW2:[10]
/Plc/DB100.DBB1
/Plc/DB2.DBD0:REAL[10]
Note
● Timers can only be read. A timer is active if it contains a value other than 0.
● If the data type CHAR or STRING is used in conjunction with a byte access, UTF8
characters are read, but if either data type is used in conjunction with a word access, UTF16
characters are read.
● Variables of the STRING type contain the maximum length in the first byte and the actual
length in the second byte. When strings are written, the actual length is adapted accordingly.
The maximum length is not changed.
● For the STRING data type in conjunction with a byte access (e.g. "/Plc/
DB99.DBB0:STRING"), the maximum string length is 255 characters. As a result of the
UTF8 formatting, for some characters (e.g. for the "µ"), two bytes are required so that the
maximum string length is correspondingly reduced.
● Only one-dimensional arrays are supported.
5.3.4

Variable paths for machine and setting data

The variable paths for machine and setting data are stored in the address space of the
SINUMERIK Operate OPC UA server under the nodes "/Sinumerik/TEA" and "/Sinumerik/
SEA". Pay attention to the correct upper-case and lower-case of the "nodeID". The respective
identifier of the "nodeID" provides information on the correct notation.
The displayed machine and setting variables always represent only the first parameter of the
corresponding data area (channel, axis).
Table 5-4
Variable path
/NC/_N_CH_TEA_ACX/$MC_CHAN_NAME
/NC/_N_CH_TEA_ACX/$MC_CHAN_NAME[u2]
Machine data arrays are 1-indexed for access.
5.3.5

Variable paths for 1:N configuration (only target system PCU)

By default, data is accessed on the NCU which is being viewed by SINUMERIK Operate.
Switching to a different NCU in the SINUMERIK Operate results in a situation where the
SINUMERIK OPC UA server is also looking at the value of the now active NCU.
If the access is to be to a specific NCU, the NodeId must be expanded with a prefix:
42
Description
UTF8 string beginning at byte offset 2 in data block 8
Array of 10 words beginning at byte offset 2 in data block 8
Byte at byte offset 1 in data block 100
Array of 10 double words (32-bit) beginning at byte offset 0 in data block 2, which are
formatted as a floating-point number
Examples of variable paths (machine and setting data)
SINUMERIK Integrate for Engineering Access MyMachine / OPC UA
Configuration Manual, 04/2018, 6FC5397-1DP41-0BA0
Description
Channel name of channel 1
Channel name of channel 2