Linear Axis With Range Limit Switches (Not To Scale) - Siemens SIMATIC S5 Manual

System Overview
The linear axis
A linear axis is an axis with a limited traversing range. The traversing range is
restricted via
• programmable software limit switches (S
• hardware limit switches (H
• emergency limit switches (N
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N H S
A A
N /N : Emergency start/end (power section)
A E
H /H : Hardware limit switch start/end
A E
S /S : Software limit switch start/end
A E
Fig. 1-2. Linear Axis with Range Limit Switches (not to scale)
The software limit switches do not go into force until the reference point has
been determined (see Section 5.3.5).
The distance between the software limit switches and the hardware limit
switches must be such that the drive can be decelerated at the specified dece-
leration rate before it reaches the hardware limit switches. In addition to dece-
leration distance S , you must also maintain a clearance distance (X) between
BR
the end of the deceleration distance and the next limit switch.
The same applies to the distance between the hardware limit switches and the
emergency limit switches.
C A U T I O N :
Incorrect initialization of the limit switches may result in mechanical damage.
Always make sure that you observe the clearance distance (X).
1-4
/S
A E
/H )
A E
/N )
A E
Table
A
Traversing range
)
S H N
E E E
Deceleration distance S
Clearance distance X
EWA 4NEB 812 6057-02
IP 266
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