2
0
1
8
-1
2
24
Commissioning
Operating reserve
In the "Operating reserve" status (green zone), the received signal strength of the
optical data coupler is sufficient for operational purposes. The optical data coupler
should operate in the green zone within the nominal range (at least one green
LED); if the signal strength drops below this limit level, the operating reserve
indication (alarm output) is switched off. Telegrams continue to be sent until the
signal strength drops below the level required for operational purposes (red LED
only).
Alignment aid in "bidirectional" display mode
The reception level of both sides is shown at the same time on one device.
This means that the effect on the reception of both devices when aligning can be
read directly on the device. It is no longer necessary to have someone helping on
the opposite side.
The "bidirectional" display mode starts automatically when the optical data
coupler has not received any signal for more than three seconds. This may
happen due to interruption of the light beam with opaque material or deliberate
covering of the receiving lens.
In the "bidirectional" display mode, the highest reception level value is displayed:
■
Steady LED: reception level of the local device
■
Flashing LED: reception level of the opposite device
The "bidirectional" display mode is ended if the signal level on both sides is stable
and greater than the minimum reception strength for more than eight seconds.
Figure 5.3
The reception level of the local device is greater than the reception level of the
opposite side: green LED lights up (local device), yellow LED flashes
(opposite side)
Example 1
