THE CMX-24O BOARD
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Data and design subject to change without notice. Supply subject to availability
© Copyright by CERBERUS AG, CH-8708 Männedorf, Switzerland 1995
01.96
E1110A.DOC
The outputs are optoisolated open-collector type. You can drive by them a relay in order to have a relay output (the
standard relay output CMX-RB is described in Chapter 7).
Fig. 5.2 summarize two of the possible output configurations available. In case (a) the relay coil is supplied at the Vrl
voltage, that could be different from the CMX power supply voltage Vd. In (b) the external LED is supplied at the voltage
Vld: this voltage too could be different from Vd. It is however possible to supply both LEDs and relay coils at the same
voltage Vd that supplies the CMX. Table 5.4 shows the output electrical characteristics.
Feature
Value
Unit
Voltage - max
30
V DC
Current - max
100
mA
Table 5.4 - Output electrical characteristics
To properly connect the output device, connect the positive polarity to the output device free end; the ground must be
common between the output device and the CMX power supply.
If you use a relay, a voltage suppression diode is needed to suppress the opening circuit voltage. The output board is
equipped with 24 such diodes. You can use them in groups of eight by setting ON the jumpers marked W25, W26,
W27 (see Table 5.5). When you use the internal voltage suppression diodes, the following precautions apply:
•
all the pins belonging to the same octet
must be
at the same voltage
•
the relay has to be driven at the CMX board power supply voltage
•
no external voltage suppression diode is required
