Siemens SINUMERIK 840Di Function Manual page 26

Detailed Description
2.1 NC/PLC interface signals
• NC-internal:
• Alarms that trigger cancellation of the servo enable on the machine axes. Alarms, which
Canceling the servo enable when the machine axis is at standstill:
• The machine axis position control loop opens
• DB31, ... DBX61.5 = 0 (position controller active)
Canceling the servo enable when the machine axis is in motion:
If a machine axis is part of an interpolated path movement or coupling for which the servo
enable is canceled, all axes involved are stopped with a fast stop (speed setpoint = 0) and
an alarm is displayed:
Alarm: "21612 Servo enable reset during movement"
• Taking into account the parameterized temporal duration of the brake ramp for error
• The machine axis position control loop opens:
• As soon as the actual speed reaches the zero-speed range, the drive servo enable is
• The position actual value of the machine axis continues to be acquired by the control.
• At the end of the braking operation, the machine axis is switched to follow-up mode,
2-14
cancel the servo enable, are described in:
References:
/DA/ Diagnostics Guide
states:
MD36610 $MA_AX_EMERGENCY_STOP_TIME
the machine axis is decelerated with a fast stop (speed setpoint = 0) and an alarm is
displayed:
Alarm: "21612 Servo enable reset during movement"
Note
The servo enable is canceled at the latest after the delay time has elapsed:
MD36610 $MA_AX_EMERGENCY_STOP_TIME
DB31, ... DBX61.5 = 0 (position controller active)
and the time for the assigned time delay for the servo enable is started:
MD36620 $MA_SERVO_DISABLE_DELAY_TIME
canceled:
DB31, ... DBX61.6 = 0 (speed controller active)
regardless of the corresponding NC/PLC interface signal. Zero-speed and clamping
monitoring are not effective. See description above for:
DB31, ... DBX1.4 (follow-up mode).
Various NC/PLC Interface Signals and Functions (A2)
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0