Communication blocks
Function Blocks - FM 458-1 DP 2-21
Edition 12.2004
NDR Status parameter NDR
0: Task was still not started (ENR input)or is still running
1: Task was successfully completed
Default: 0
LEN Length of the previously received data in bytes Default: 0
CTR This output counts the total number of successfully complete data
receive
cycles since the last change from STOP to RUN.
Default: 0
ERR An error is output at block output ERR. The detailed information about
the
type of the error is available at output STA.
This output corresponds to the ERROR output of an SFB/FB 13
of an S7-CPU.
Default: 0
STA Detailed status display
This output corresponds to the STATUS output of an SFB/FB 13 of an
S7-CPU.
ERR = 0:
• STA=00H
No alarm, no fault
• STA=11H
Non-synchronous data is received, output LEN indicates the number
of pieces of data previously received in bytes.
ERR = 1:
• STA=01H
Communication problems
(e.g. the coupling description to the ID not loaded, coupling has still
not been established from the partner or the coupling was
interrupted)
• STA=04H
Error regarding the data length
The data block sent is longer than the receive range set using input
RLN.
• STA=05H
Reset request received, incomplete transfer
• STA=12H
R_ID already exists in the coupling
• STA=14H
too little working memory
Default: 0
QTS Block output QTS indicates whether the block is operating (QTS = 1) or
became inactive after a communications error message was entered
(QTS = 0).
Default: 0
YTS Detailed status display
• YTS=0 Æ O.K. (ready)
• YTS=1
The block is in the DISABLED state, i.e. ENR=0
• YTS=2
The initialization connection is changed, the change only becomes
effective at the next STOP Æ RUN transition; the FB operates with
the values at ID, RID and RLN set when running-up
For other values at YTS, in addition, a communications error is entered
in
the diagnostics buffer and the block is no longer processed (QTS=0)
Default: 0
To Next Page
Loading...
