Motion synchronous actions
10.3 Main run variables for synchronized actions
Job planning
Programming Manual, 07/2010, 6FC5398-2BP40-0BA0
569
10.3.10 FIFO variables ($AC_FIFO1[n] ... $AC_FIFO10[n])
Function
10 FIFO variables (circulating buffer store) are available to store associated data sequences.
Data type: REAL
Application:
● Cyclical measurement
● Pass execution
Each element can be accessed in read or write
FIFO variables
The number of available FIFO variables is defined in machine data
MD28260 $MC_NUM_AC_FIFO.
The number of values that can be written into a FIFO variable is defined using machine data
MD28264 $MC_LEN_AC_FIFO. All FIFO variables are equal in length.
The sum of all FIFO elements is only generated if bit 0 is set in
MD28266 $MC_MODE_AC_FIFO.
Indices 0 to 5 have a special significance:
Index Significance
While writing: New value is saved in the FIFO. 0
While reading: The oldest element is read and removed from the FIFO.
1 Access to oldest stored element
2 Access to latest stored element
3 Sum of all FIFO elements
4 Number of elements available in FIFO.
Read and write access can be assigned to each element of the FIFO. FIFO
variables are reset by resetting the number of elements, e.g. for the first FIFO
variable: $AC_FIFO1[4]=0
5 Current write index relative to beginning of FIFO
6 to n
max
Access to nth FIFO element
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