Siemens SIMATIC S5 Manual page 216

IP 265
Process
Profile length control procedures are as follows:
• Light barriers L2 and L3 are 0.1 mm apart (permissible length tolerance). The mean distance
between L1 and L2/L3 represents the normal length of a profile. Light barriers L1, L2 and L3 are
connected to the IP 265's 24 V inputs.
• When a profile triggers a positive edge at light barrier L1 while in transport, the signals from light
barriers L2 and L3 are evaluated simultaneously. If L2 generates no signal, the profile is too
short; if L3 generates a signal, the profile is too long. In both cases, the profile must be rejected.
Profiles are rejected as follows:
• The profiles are pushed from the conveyor belt onto a distributing slide which separates the
"good" profiles from the "reject" profiles. The IP 265 has full control of the distributing slide.
• BEROs B1 and B2 represent the right and left final position of the distributing slide. BEROs B3
and B4 indicate whether the profile and distributing slide are in the proper position so that
distribution can begin. The distributing slide is driven by a motor which is switched to ON/OFF or
clockwise/counterclockwise rotation via two IP 265 outputs.
Load on the IP 265 interfaces
Control word
Status word
: Interface areas used in the
sample application
Figure 11-3. IP 265 Interfaces Used in the Sample Application:
EWA 4NEB 812 6130-02a
IP 265
IPs
OPs
"Length Measuring System for Profiles"
Sample Applications and Programming Aids
24 V inputs (DIs):
I 0.0 to I 0.6
DIs
I/Os
IP 265
user
program
DQs
24 V outputs (DQs):
Q 0.0, Q 0.1
13-3