Siemens SINUMERIK 840C - Manual (Page 755)

09.95 10 Axis and Spindle Installation
10.5.3 Positioning mode, M19, M19 through several revolutions
10.5.3.6 Aborting the positioning mode
The specified position is regarded as having been reached (or the distance as having been
traversed) when the spindle is within the position window. This is signalled to the PLC by
setting IS:SPINDLE POSITION REACHED.
The position is held under position control until the M19 function is aborted. The conditions for
aborting are as follows:
• IS ACKNOWLEDGE M19
• M3/M4 in part program or command channel
• Select C axis or synchronous mode
• Program end
• Reset
M19 and RESET
NC MD 520* bit 6 (no M19 abort on RESET) can be set to prevent function M19 aborting on
program end (M30/M2) or RESET (key). In this case, M19 can only be aborted by signal
"Acknowledge M19" from the PLC or by alarms ”Remove NCBB2” or ”EMERGENCY STOP”.
Otherwise function M19 is only aborted on channel-specific reset if the channel is aborted for
which the spindle is entered in the channel DB as the spindle of that channel.
Setting IS:SPINDLE DISABLE or resetting IS:SERVO ENABLE interrupts the positioning mode.
If the signal is reset again or set again, positioning is continued, but with the following
exception:
• If the positioning mode was selected from the command channel, it will be interrupted if
IS:SERVO ENABLE is reset. An error message will be entered in the user interface.
Positioning will not be continued, however, if the signal is set again.
© Siemens AG 1992 All Rights Reserved 6FC5197- AA50 10–65
SINUMERIK 840C (IA)