Siemens IP-Module Manual Pagina 33

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IP 266 Technical Description of the 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 chassis ground to ensure fault-free module
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)
Figure 2-8. Switch Connections on the Terminal Block
N
A
/N
E
: Emergency limit switch start/end (power section)
H
A
/H
E
: Hardware limit switch start/end
S
A
/S
E
: Software limit switch start/end
Ref: Reference point switch
Table
RefN
A
H
A
S
A
S
E
H
E
N
E
2 2
1 3 5 7 9 1 3 5 7 9
4 6 8 10 4 6 8 10
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
2-11
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