Scanlab RTC 5 PC Interface Board, Installation And Operation Manual

Page: 257 / 622

RTC
®
5 PC Interface Board
Rev. 1.9 e
10 Commands And Functions
257
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Ctrl Command execute_list_pos
Function starts list execution (“List 1” or “List 2”) at the specified position.
Call
execute_list_pos( ListNo, Pos )
Parameters
ListNo
number of the list to be executed as an unsigned 32-bit value;
permissible values: [uneven: “List 1“, even: “List 2“]
Pos
address of the first list command to be executed (offset relative to the start of
the respective list) as an unsigned 32-bit value; allowed range: [0 … (2
20
–1)]
Comments • The command will be ignored ( get_error return value =
RTC5_BUSY
) if the board’s BUSY
status or PAUSED status is currently set (list is being processed or has been halted via
pause_list or set_wait ). If the board’s INTERNAL-BUSY status is currently set,
execute_list_pos is only executed with a delay (after INTERNAL-BUSY has been reset
again). No checks are performed to determine if a list is currently being loaded. During
list processing, the other list (or even the same list) can be simultaneously reloaded (also
see
"List Handling", page 71 ).
• Programs in the protected area (“List 3”) can’t be directly executed via
execute_list_pos . They can only be called from a list (“List 1” or “List 2”) as a subrou-
tine. Alternatively, the corresponding area can be assigned via config_list to “List 1” or
“List 2”.
• Uneven
ListNo
values cause “List 1” to be executed; otherwise “List 2” will be
executed. This allows automatically generated continuous list changing via an incre-
mented count.
• If “List 2” has not been assigned memory (
Mem2
= 0, see config_list ) then “List 1“ will
be opened.
• If
Pos
is specified as being larger than the memory area of the respective list (
Pos
>
Mem1
or
Pos
>
Mem2
), then
Pos
will be set to 0.
• The BUSY list status of the selected list is set and the BUSY list status of the other corre-
sponding list is reset (see read_status ). The BUSY list execution status (see get_status )
is set.
• Execution stops when a set_end_of_list command is encountered. If the end of a list
area is reached without encountering a set_end_of_list command, then execution will
continue at the beginning of the same list area instead of with the next list. The output
pointer will remain in the active list area unless a
set_end_of_list command was
encountered and an auto_change_pos or start_loop command was previously issued.
For both lists to be treated as a single list, you must set the configuration appropriately:
e.g.
( Mem1+Mem2, 0 )
.
• If a home jump (defined with home_position or home_position_xyz ) was executed via
set_end_of_list , then execute_list_pos will lead to a corresponding home return (the
INTERNAL-BUSY status is set while the home return is executed).
• The execute_list_pos command triggers a flush of the list input buffer (see page 71 )
even if the start was unsuccessful.
• execute_list_pos also covers the specialized variants execute_list_1 , execute_list_2 ,
execute_list and execute_at_pointer .
RTC
®
4

RTC
®
5 new command
References execute_list , execute_at_pointer , set_start_list_pos