Siemens SINUMERIK 840Di Function Manual page 1058

Detailed description
2.12 Block descriptions
State
WORD H
0
0
0
0
0
0
0
Configuration steps
To be able to read a GUD variable, its name must be stored in a string variable. The data
block with this string variable must be defined in the symbol table so that the "Addr"
parameter can be assigned symbolically for FB GETGUD. A structure variable can be
defined optionally in any data area of the PLC to receive the variable pointer (see
specification in following example).
Pulse diagram
(1)
(2)
(3)
(4)
(5)
(6)
2-146
WORD L
4
6
7
8
9
10
11
Activation of function
Positive acknowledgment: variables have been written
Reset function activation after receipt of acknowledgment
Signal change by means of FB
If function activation is reset prior to receipt of acknowledgment, the output signals are not
updated without the operational sequence of the activated function being affected.
Negative acknowledgment: Error has occurred, error code in the output parameter state.
Meaning
Data areas or data
types do not tally
FIFO full
Option not set
Incorrect target area (SD) RD may not be local data
Transmission occupied
Error in addressing
Address of variable
invalid
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Note
Check data to be
read in RD
Job must be repeated,
since queue is full
BP parameter "NCKomm" is not set
Job must be repeated
Unit contains value 0
Check Addr (or variable name), area,
unit
Power Line Basic PLC Program (P3)