THE RELAYS OUTPUT BOARD CMX-RB
E1110A.DOC
Data and design subject to change without notice. Supply subject to availability
© Copyright by CERBERUS AG, CH-8708 Männedorf, Switzerland 1995
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7 The relays output board CMX-RB
The CMX-RB (CD91205) is a relay output board that converts the CMX open collector output into a relay output. The
CMX-RB layout is sketched in Fig. 7.1; the following description assumes you are looking at the board with the
orientation of the drawing.
The CMX-RB is mounted on a plastic support that allows you to mount the board on a DIN rail.
The eight black blocks are the relays; the output connections can be done using the connectors. For each relay three
screw are provided. For each output the rightmost screw (Fig. 7.1) is the common, the second screw is the normally
closed contact and the third screw is the normally open contact. They are marked COM (for the common connection),
NC (normally closed contact) and NO (normally open contact).
The CMX-RB could be connected to the CMX-xx using the supplied flat cable, that must be used in conjunction with the
CMX-MB mounting bracket (see Chapter 8). The CMX-RB is powered by the CMX-xx.
The jumper marked J1 on the board is used to set the relays operating voltage. When the two rightmost pins are
shorted by a jumper (the default condition), the relay board operates at 24 V (rightmost with reference to Fig. 7.1).
In this configuration, the voltage regulator circuit in the upper right angle of the board, is active. Should you use a
power supply that outputs 12 V max and should you have trouble with the relays, try to short the leftmost pins. In this
configuration, the internal voltage regulation is performed and the relays are operated directly by the supply voltage.
Fig. 7.1
The relay characteristics are listed in Table 7.1.
FEATURE
VALUE
UNIT
Contact voltage
max
48
V
min
50
mV
Contact current
max
1.25
A
min
50
µ
A
Operating temperature
-30 + 90
°C
Table 7.1
