2TLC
172289M0201
Rev C
31
www.abb.com/jokabsafety
2018-04-17
7 Functions
7.1 Acknowledge function
The Acknowledge function is used in presence of an internal error like an optical error, an OSSD error or an EDM
error.
The Acknowledge function is activated by pressing an external NC contact (ACKNOWLEDGE/RESET push-button) for
at least 5 s in Error mode. The AOPD then returns to normal operation mode.
Figure 28
– Time chart of the Acknowledge function
If the error is not solved before the Acknowledge, the AOPD remains in the same error mode, whatever the error.
NB: Some errors are critical errors and the device must be turned off and on to return to normal operation mode:
Microprocessor error
Reset selection error
7.2 Reset function
The interruption of a beam by an opaque object causes the OSSD outputs to switch off (OSSD OFF state
).
The AOPD can be reset to the OSSD ON state
in two different ways:
Automatic Reset
:
When activated, the AOPD returns to OSSD ON once the object has been removed from the detection zone.
Manual Reset
:
When activated, the AOPD returns to OSSD ON once the RESET button has been pushed, provided that the
object has been removed from the detection zone. The condition when the object has been removed and the
system is waiting for reset is called interlock and is signalled on the display (see paragraph 8.2
”).
Warning!
Carefully assess risk conditions and reset modes. In applications protecting access to hazardous zones, the
Automatic Reset function is unsafe when the operator can stand in the hazard zone without being detected. In this
case, the Manual Reset of the AOPD or the safety relay is necessary (see paragraph 5.2
”).
