Siemens SIMATIC S5 Manual page 282

Start-Up
Refer to the following figure when you want to simulate tripping of a limit switch
within the traversing range:
N H
A A
Traversing range
N /N : Emergency start/emergency end limit switch
A E
(power section)
H /H : Hardware start/hardware end limit switch
A E
Figure 8-2. Linear Axis with Range Limit Switches (not to scale)
Move the drive at a controlled jog toward the hardware start limit switch.
During traversing, actuate the relevant limit switch briefly, then release it.
The drive decelerates at maximum deceleration speed.
Travel is now possible only in the direction of the hardware end limit switch.
Move the drive at a controlled jog toward the hardware end limit switch.
During traversing, actuate the relevant limit switch briefly, then release it.
The drive decelerates at maximum deceleration speed.
Bidirectional travel is now impossible.
Should this situation occur, you must hold the relevant hardware limit switch in
one of the two directions before starting the "controlled jog".
8-16
Table
Traversing range
IP 266
H N
E E
Deceleration distance S
Br
Clearance distance X
EWA 4NEB 812 6057-02