Siemens SINUMERIK 840C Installation Instructions Manual page 960

09.95
0
• IKA/TC motion in positive direction
• SW limit switch monitoring prior to traversal knows only P
output an alarm
• Alarm 148* is output during traversal when P
b) With an NC setpoint P
NC
of IKA/TC (negative IKA/TC motion).
0
• IKA/TC motion in negative direction
• SW limit switch monitoring prior to traversal knows only P
alarm 2065, "Programmed position beyond SW limit switch" even though machine
position P belonging to this NC setpoint is located in front of the SW limit switch.
M
With IKA Stage 2, the time when the software limit switch is scanned depends on the axis
setpoint position. Monitoring in the position controller might result in a slight overshoot of the
software limit switch.
Effect of direction-dependent compensation - backlash compensation
When an IKA/TC table is defined with positive and negative output values, the output quantity
axis is moved in various directions. This does not however mean that this reversal of direction
is detected or evaluated by any other direction-dependent IKA compensation (backlash
compensation) which may be present. These types of compensation detect reversals of
direction on the basis of part setpoints at the output of the velocity control.
© Siemens AG 1992 All Rights Reserved
SINUMERIK 840C (IA)
P
1
Path distance to go
SW
, a machine position PM is reached during traversal as a function
P
1
Path distance to go
6FC5197- AA50
12 Functional Descriptions
12.19.3 Interlocks and monitoring
SW limit switch +
P
P P
SW
NC
IKA value
and does not therefore
NC
is reached.
SW limit switch +
P
P SW P
M
Compensation
value
and therefore outputs
NC
M
NC
12–185