Datalogic SG4 FIELDBUS Series, Instruction Manual, Page: 50 / 136

40 SG4 EXTENDED
CHAPTER 7
FUNCTIONS
This chapter deals with all the functions of the light curtain.
RESTART MODE
An opaque object detected by the beams causes the switching of the OSSD outputs (i.e.
the opening of the safety contacts - SAFE condition).
The restart mode allows the user to define how the light curtain returns in a Normal
Operation condition.
The restart of the ESPE (i.e. the closing of the OSSD safety contacts - SAFE condition) can
be carried-out in two different ways: Automatic or Manual Restart.
Automatic Restart:
when an opaque object is detected, the ESPE enters in the SAFE
condition. Then, after the object has been removed from the controlled area, the ESPE
begins its normal functioning again.
The response time is the time between the object introduction in the protected area
and the OSSDs achieving the OFF state (SAFE); the recovery time is the time within
OSSDs go in the ON state (SAFE) after the object is removed.
These times depend on the light curtain length. Please refer to the tables in chapter
"
Available Models and Response Times" on page 86
for further details.
Figure 1 - Restart timings (auto)
In Automatic Restart the RESTART input (pin 3 of M12-12 poles or pin or Pin 1 of M12-8
poles - RX side) has to be left floating on SG4-P models or connected to 24V on SG4-N
models.