Siemens SINUMERIK 828D Function Manual page 448

H2: Auxiliary function outputs to PLC
8.13 Block-search response
Output counter
The user can output the collected auxiliary functions to the PLC on a channel-by-channel basis in the block
search ASUB. For the purposes of serialized output via multiple channels, the three output counters are changed
across all the channels each time an auxiliary function is output:
$AC_AUXFU_TICK[<n>,<m>] (output counter for the active auxiliary function)
<n>: Group index (0 to 63)
<m>: Output counter (0 ... 2)
0: Output sequence counter (All outputs within an IPO cycle)
1: Package counter within an output sequence in the IPO cycle
2: Auxiliary function counter within a package
Explanation:
An auxiliary function package comprises a maximum of 10 auxiliary functions.
Two packages can be processed per IPO cycle in each channel during SERUPRO because synchronized
actions are processed in this cycle.
An output sequence of up to a maximum of 20 packages (2 packages per channel * 10 channels) can be
processed within an IPO cycle across all channels.
This encoding defines how many auxiliary function packages and, within these, how many auxiliary functions
have been processed during the same IPO cycle: Auxiliary functions which have been collected in one IPO cycle
all have the same sequence counter. Auxiliary functions which have been collected in one package (block or
synchronized action) all have the same package counter. The total on the auxiliary function counter increases
every time an auxiliary function is collected.
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Function Manual, 09/2011, 6FC5397-0BP40-2BA0
Basic Functions