8540573 • 16/09/2016 • Rev.20 29
"SYSTEM STATUS" OUTPUT (“M” MODELS)
A signal that makes it possible to detect 2 separate items of information is available on pin 4 of
the receiver:
1. Weak signal arriving from the Emitter;
2. Status of the OSSD outputs.
The output signal will be set to one (24 Vdc) or zero (according to the status of the
OSSD) if the weak signal condition is not present
The output signal will be at one (24 Vdc) or zero with impulses towards 0 V or
towards 24 in weak signal conditions.
The conditions of the signal concerned are summarized in the figure below:
Figure 28
TEST FUNCTION
By means of the test function, which simulates occupation of the protected area, it possible to
verify the operation of the entire system by means of an external supervisor (e.g. PLC, control
module, etc.). The JANUS barrier system features an automatic self-diagnosis function that
enables it to detect response time malfunctions (this time is declared for each model).
This safety system is permanently active and does not require any interventions from the outside.
The TEST function is available should the user wish to check equipment connected downstream
of the barrier (without physically entering the protected area). By means of this function the
OSSDs can be switched from ON to OFF as long as the function remains active. Please see
Table 6 for details about the use of the test function.
The minimum duration of the TEST function must be 40 msec.
SAFETY MODULES MJB1 - MJB2 - MJB3 - MJB4
JANUS light curtain can be integrated by the safety modules MJB1 - MJB2 - MJB3 and MJB4.
In fact they contain terminal boards, pre-wired connection, dip switches for the configuration
choice and two safety relays connected to the light curtain outputs.
MJB1 - MJB3 operates with Janus M (muting) and has: RESTART push button,
key selector for the Muting OVERRIDE, muting function active signaling lamp and two
safety relays.
MJB2 - MJB4 operates with Janus J (without muting) and has: RESTART push
button and two safety relays.
OSSD outputs de-activated and
indication of weak signal de-activated.
OSSD outputs active and indication of
weak signal de-activated.
OSSD outputs de-activated and
indication of weak signal active.
OSSD outputs active and indication of
weak signal active.
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