Block library TeleControl ST7
5.7 Master copies
TIM 1531 IRC
Operating Instructions, 02/2018, C79000-G8976-C468-02
193
Error when processing "SendAll"
"SendAllError" is set to TRUE when the connection is interrupted during pr
o-
cessing of "SendAll". Apar
t from this an entry is written to the diagnostics buff-
"SendAllError" remains set to TRUE until it is reset by the user program or by
the next CPU restart.
Data typical Dat256D_R
Function
Receive maximum of 256 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,
● 32 Bool
● 4 bytes
● 2 words
● Any combination such as 2 bytes plus 1 word etc.
Note
Remember double word boundaries
When changed data is transferred and the data area contains values in double word format,
make sure that the double word values are actually located in one of the maximum 256
double words of the data area to be acquired.
Distribution over two consecutive data double words could lead to the transfer of only one
word of the double word value (high or low word) because a change has occurred in only
that particular word. In this case, the missing word can lead to a data error
on the receiving
partner (applies to ST7cc, not for an S7 CPU).
Dat256D_R stores the received data without further processing in the data area defined by
"DataOutput". Evaluate the received data with the user program.
With S7-300 CPUs with X communication, the maximum length of a data frame is 76 bytes
(net 48 bytes). 1024 bytes of net data are transferred using a serial transfer process
consisting of a sequence of at least 22 data frames (segments). Each data frame apart from
the last contains a segment of 48 bytes of net data of the output data area.
Each time a detected data segment is received, this is indicated by a corresponding status
(bit 1 to 22) of the "NewData" output parameter.
To Next Page
Loading...
Need help?
General
