Reference Point Switch (Pin 4); External Stop (Pin 6) - Siemens SIMATIC S5 Manual

Technical Description of the IP 266
2.5.2

Reference Point Switch (Pin 4)

The drive system is synchronized by reference point approach. The reference
point switch must be connected to pin 4 on the terminal block (see Figure 2-8)
and must lie between the two hardware limit switches. You must make sure that
there is enough room between the reference point switch and the hardware
switches for the drive to decelerate for reference point approach without
reaching a hardware limit switch.
2.5.3

External Stop (Pin 6)

Machining can be stopped via the "External Stop" input. Travel is then stopped at
the maximum specified deceleration rate and the IP 266 signals an "External
stop". This signal also aborts the machining program (see Section 5.4). In
Automatic mode, a dwell can also be cancelled.
C A U T I O N :
An "External stop" in the "Follow-up" and "Controlled jog" control modes
restarts the position controller.
The polarity of the "External Stop" can be specified in the machine data.
2-12
IP 266
EWA 4NEB 812 6057-02