Oldham MX62, User Manual

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Page 14
ATTENTION!
It is not allowed to use the ADVANCED relay functions in a safety related
ATEX application with measuring function for explosion protection or a SIL
application.
Up to eight relay modules with a total of 128 relays can be integrated into
the system. The redundant, opto-isolated RS485 bus allows spatial
separation (up to 800 m) of the modules and control unit.
An address between 1 and 8 is allocated to each module by rotary switch.
Open circuit:
The relays are activated as soon as the respective status is recognized, i.e.
the relay inductor pick up.
Closed circuit:
The relays are activated in normal operation, i.e. the relay inductor have
picked up, and will be deactivated in case of alarm, i.e. the relay inductor
will be released.
2.1.5. Loop module (LOOPM)
The LOOPM for WinPro
®
/ MX62 offers the possibility to build a
network of digital detectors or to record signals of any standard 4-20 mA
detector by means of AEM connected to the LOOPM.
The LOOPM can be employed in three different configurations:
a) As regular Loop Module with up to 16 digital transmitters (e.g.
TBGW EX) linked to the closed loop (address 1 to 16).
When using this type of configuration, no additional AEM can be
connected.
b) With one AEM and up to 8 digital detectors linked to the loop
(address 9 to 16).
c) With two AEM for connection of up to 16 standard 4-20 mA detec
tors. In this case, digital detectors cannot be linked to the loop.
Connection of digital detectors to the loop is realized by junction boxes
(part no. 81090). Junction cables must not exceed a length of 30 cm.
ATTENTION!
When connecting digital detectors to the LOOPM, the current output (4-20 mA)
inside the detectors has to be blocked with a shunt resistance of approx. 180
ohms between ground (GND) and current output (4-20 mA).
Furthermore, the two jumpers inside the detector for the bus end resistance
(jumpers for RS485, next to the connection for power supply) need to be
removed.