Siemens SINUMERIK 840Di sl Function Manual page 46

Detailed description
2.4 Actions in synchronized actions
Restrictions
No more than 10 auxiliary functions may be output simultaneously (i.e. in an OB 40 cycle of
the PLC). The total number of auxiliary function outputs from part programs and
synchronized actions must never exceed 10 at any point in time.
Maximum number of auxiliary functions per synchronized action block or technology cycle
block:
• 5 M functions
• 3 S functions
• 3 H functions
Predefined M functions cannot be programmed by means of synchronized actions. They will
be rejected by an alarm.
WHEN ... DO M0 ;Alarm
However, the spindle-M-functions are allowed: M3, M4, M5 and M17 may be programmed as
the end of a technology cycle.
Message acknowledgment
Technology cycle blocks (see Chapter "Call of technology cycles") containing auxiliary
function outputs are not completely processed until all auxiliary functions in the block have
been acknowledged by the PLC. The next block in the technology cycle is not processed
until all auxiliary functions in the preceding block have been acknowledged by the PLC.
The acknowledgement behavior has been expanded to include other variants:
• Output of auxiliary functions without block change delay
The user can choose between INT and REAL as the data type for H auxiliary functions. The
PLC user program must interpret the values in accordance with the definition. The INT value
range for H auxiliary functions has been increased to: -2 147 483 648 to 2 147 483 647.
References:
/FB1/ Function Manual Basic Functions; Auxiliary Function Output to PLC (H2)
46
High-speed auxiliary functions (QUICK) first, as a parallel process in the PLC, then
auxiliary function output with anticipated acknowledgment.
Function Manual, 11/2006, 6FC5397-5BP10-2BA0
Synchronized actions