Parameters ($Ac_Param) - Siemens SINUMERIK 828D Function Manual

2.3.5

Parameters ($AC_PARAM)

The $AC_PARAM[<index>] variables are channel-specific arrays of system variables for use
as general buffers.
Data type:
<Index>:
Number per channel
The maximum number of $AC_PARAM variables per channel can be set via the machine
data:
MD28254 $MC_MM_NUM_AC_PARAM = <maximum number>
Storage location
The storage location of the $AC_PARAM variables can be defined channel-specifically via
the machine data:
MD28255 $MC_MM_BUFFERED_AC_PARAM = <value>
Value
0
1
Note
Data backup and memory space
• The $AC_PARAM variables created in the static memory can be saved channel-
• Please ensure that sufficient memory is available in the selected memory area. An array
Reset behavior
The reset behavior depends on the storage location of the $AC_PARAM variables:
● Dynamic memory: Initialization with the value "0"
● Static memory: Retention of the current value
Synchronized actions
Function Manual, 07/2012, 6FC5397-5BP40-3BA0
REAL
Array index: 0, 1, 2, ... (max. number - 1)
Storage location
Dynamic memory (default setting)
Static memory
specifically via the data backup. Data block: _N_CH<channel number>_ACP
element requires 4 bytes of memory space.
2.3 System variables for synchronized actions
Detailed description
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