Beckhoff AX2000 - Page 68

Position register
A programmable register that can have various functions assigned to it.
Make changes only while the amplifier is disabled + reset.
Position register
Function Comment 1 (SWE1) 2 (SWE2) 3 (SWE3) 4 (SWE4)
inactive
-
xxxx
Pos. not reached
threshold for signal
xxxx
Pos. overshot
threshold for signal
xxxx
SW limit-switch 1
limit-switch function
x---
SW limit-switch 2
limit-switch function
-x--
SW limit-switches1/2
The software limit-switches from part of the monitoring functions of the position controller.
SW limit-switch 1
The monitoring checks whether the actual position value is lower than the preset
value (the negative direction of travel is now inhibited – You have to leave
limit-switch 1 by moving in the positive direction. ).
SW limit-switch 2
The monitoring checks whether the actual position value is higher than the preset
value (the positive direction of travel is now inhibited – You have to leave
limit-switch 1 by moving in the negative direction.)
The drive brakes with the emergency ramp, and remains at standstill under torque.
The principle of positioning the software limit-switch can be seen in the diagram below:
Legend
MA1 : Machine stop, left
HE1 : Hardware limit-switch, left
NI : Zero pulse initiator (reference)
SE1 : Software limit-switch 1
SE2 : Software limit-switch 2
HE2 : Hardware limit-switch right
MA2 : Machine stop right
+ : Positive count direction
- : Negative count direction
ASCII: SWCNFG (set)
Default: 0 valid for all OPMODES
ASCII: SWEx (position)
Default: 0 valid for all OPMODES
Configuration variables for the position register. SWCNFG is a binary-coded bit-variable, and is transferred to
the ASCII terminal program as a decimal number.
Bit-variable SWCNFG
Bit Value Description Bit Value Description
2
0
0
Monitoring of SWE1 inactive
2
8
0
Monitoring of SWE3 inactive
1
Monitoring of SWE1 active
1
Monitoring of SWE3 active
2
1
0
Signal for actual position>SWE1
2
9
0
Signal for actual position>SWE3
1
Signal for actual position<SWE1
1
Signal for actual position<SWE3
2
2
0
SWE1 functions as signal threshold
2
10
0
Reserve
1
SWE1 functions as SW limit-switch
1
2
3
0
Reserve
2
11
0
Reserve
11
2
4
0
Monitoring of SWE2 inactive
2
12
0
Monitoring of SWE4 inactive
1
Monitoring of SWE2 active
1
Monitoring of SWE4 active
2
5
0
Signal for actual position>SWE2
2
13
0
Signal for actual position>SWE4
1
Signal for actual position<SWE2
1
Signal for actual position<SWE4
2
6
0
SWE2 functions as signal threshold
2
14
0
Reserve
1
SWE2 functions as SW limit-switch
1
2
7
0
Reserve
2
15
0
Reserve
11
68 Setup Software
Screen page "Position Data" 07/03 BECKHOFF