Reer JANUS MJBOX User Manual
8540705 • 18/12/2012 • Rev.6 9
INTERCONNECTION MODULES
JANUS MJBOX
GENERAL INFORMATION
The JANUS MJBOX modules are accessory devices designed to make the wiring of
JANUS J and J TRX, JANUS M and M TRX light curtains fast and safe, and to provide
the main controls necessary for their operation close to the protected gate.
In addition to the guided contacts safety relays piloted and monitored by the light
curtain, terminal boards for connecting the cables, bridges and dip-switch for the
configuration of the light curtain itself are also present inside.
DESCRIPTION
Externally both models have:
1. Connectors for connecting with the light curtain (M23 for RX and M12 for TX).
2. Fairlead for passage of cables towards the machine for:
- power supply;
- connection with output contacts of the internal safety relays and static
outputs of the light curtain;
- Muting enable signals from the outside;
- output signals which indicate the status of the safety light curtain.
The MJB1/MJB3 models also present:
1. Lighted restart button and output status / weak signal led.
2. Key selector switch for Override function.
3. Lamp to signal Muting/Override active.
Figure 1 - MJB1/MJB3
OVERRIDE
KEY
MUTING LAMP /
OVERRIDE
RESTART BUTTON -
OUTPUT STATUS LED
CABLE
FAIRLEAD
RX
TX
(Janus)
10 8540705 • 18/12/2012 • Rev.6
The MJB2 /MJB4 model has:
1. Lighted restart button and output status / weak signal led.
Figure 2 - MJB2/MJB4
It is also possible to match the MJB2 and MJB4 models (without muting
lamp and override command) with muting light curtains as they are fitted
with the required settings.
If connecting an MJB1 or MJB3 model to a JANUS J series safety barrier
(without Muting function), the following connections must be disregarded:
SW1 (pins 1,2,3,4), CJ5, CJ7 (pins 7,8) and CJ9.
For the JANUS, MI, ML, MT versions use of a muting lamp (internal or
external) (0.55W) is obligatory for correct functioning of the light
curtains.
Where the risk analysis of the application requires it, the light curtain
permits connection of an external lamp to signal active Muting (0.55W).
Perform a check of the operation of this lamp periodically verifying its
turning on during the Muting or Override phase.
CABLE
FAIRLEAD
RX
RESTART BUTTON –
OUTPUT STATUS LED
TX
(Janus)
8540705 • 18/12/2012 • Rev.6 11
CONFIGURATION
With the aid of the figures of the main board of the single models, the
configuration of the methods of the operating modes is described below.
This configuration is performed, following the descriptions of the following tables,
setting the various jumpers, connectors and dip-switches present on the same
card.
Figure 3 - Models MJB1/MJB2 main board
Figure 4 - Models MJB3/MJB4 main board
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