Siemens SINUMERIK 880 SW 6 Planning Manual page 281

8 Spindle/PLC Interface (DB 31)
8.4 Signals for synchronous mode from spindle
EMERGENCY RETRACTION ACTIVE
1 signal: Synchronism between the following spindle and its leading spindle is disturbed
and the positional deviation is greater than the specified emergency retraction
threshold.
0 signal: The following spindle is in synchronism with the leading spindle.
Notes:
• The emergency retraction threshold is specified in MD 9x4 (x = 5, 7, 9 for following
spindle 1, 2, 3).
• The emergency retraction threshold is monitored only if synchronous mode is selected and
the "Enable emergency retraction" setting data bit for the following spindle is set.
• A delay of 2 IPO cycle times plus 1 PLC cycle time must be anticipated between
exceeding the threshold and the signal being set.
• The EMERGENCY RETRACTION message can also be output directly as a hardware
signal subject to the availability of a mixed I/O module in the servo area. This is effected
much quicker (in time with the position control pulse) than output of the interface signal.
• With this signal, the alarm EMERGENCY RETRACTION is output and the servo enable is
cancelled.
• The signal is of significance only to the following spindle in synchronous mode.
Example of application:
This signal can be used in conjunction with parting monitoring. The workpiece is clamped in
following and leading spindles. After the parting operation a defined angular offset between the
leading and following spindles is programmed.
If the parting operation was unsuccessful the angle cannot be accepted. The positional
deviation becomes too great and the signal is set; an alarm is issued at the same time.
8–28 ©
Siemens AG 1991 All Rights Reserved
05.91
DW L + 24, bit 13
6ZB5 410-0HE02
SINUMERIK 880, (PJ)