Technical data

SINAUT TD7 software package for the CPU
2.5 Data point typicals
Software
System Manual, 07/2009, C79000-G8976-C222-07
283
Note
The changed data area that is transmitted consists of the first and the last double word in
which a change was detected and all words located in between, even if these have not
changed.
Example:
The area to be read is 10 double words long. In this case, changes were detected in the 2nd,
5th and 8th double words. The transmitted area is therefore from the 2nd to the 8th double
word inclusive.
Note
This is an in/out parameter (declaration IN_OUT). It is difficult to specify local bit memory
with this parameter type and this should not be used.
2.5.14 ST7 data typical FB Dat12D_S
Function
Send maximum of 12 double words with any data content.
The content of each double word may be a value in double word format (e.g. DINT, REAL
etc.); it can also be a mixture of other formats which together form a double word, for
example,
● 4 bytes, or
● 2 words, or
● 2 bytes plus 1 word.
Sending the data area can be triggered in two ways:
● By a change check. Transmission is triggered as soon as a bit changes. (Parameter
SendOnChange = TRUE)
● The user program decides when a transmission will take place (signal edge change from
0 to 1 at TriggerInput).
This could also be a time-driven transmission. This case, you could use FC Trigger.