Hardware Limit Switches (Pins 3/5) - Siemens SIMATIC S5 Manual

IP 266
C A U T I O N :
Always connect reference potential L- (pin 2 on the terminal block) with the
programmable controller's
operation.
The polarity of the hardware limit switches and the "External STOP" can be
specified in the machine data. When you set the machine data parameters, you
can choose between "pos" (positive) polarity for NO contacts and "neg"
(negative) polarity for NC contacts.
2.5.1

Hardware Limit Switches (Pins 3/5)

1 3
2 4
N H S
A A A
N /N : Emergency limit switch start/end (power section)
A E
H /H : Hardware limit switch start/end
A E
S /S : Software limit switch start/end
A E
Ref: Reference point switch
Figure 2-8. Switch Connections on the Terminal Block
The hardware limit switches restrict the traversing range of the drive system to
defined limits, and must be connected to terminal block pins 3 and 5.
EWA 4NEB 812 6057-02
Technical Description of the IP 266
chassis ground
5 7 9 1 3 5 7 9
6 8 10 2 4 6 8 10
Table
Ref
to ensure fault-free
S H N
E E E
module
2-11