Power Connections; Isolation Circuitry; Input Isolation Circuitry; Output Isolation Circuitry - National Instruments NI 6520 User Manual
Contains five form a single-pole single-throw (spst) non-latching relay outputs, three form c single-pole double-throw (spdt) non-latching relay outputs, and eight channel-to-channel isolated industrial inputs
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Power Connections
Isolation Circuitry
Isolation Voltages
Do not exceed the isolation voltage limits. Exceeding the voltage limits may
Caution
cause injury or permanently damage the NI 6520 components. National Instruments is
not liable for any damage resulting from signal connections that exceed these limits.
© National Instruments Corporation
To connect to the NI 6520/6521 signals for Form A relays, connect NO and
COM, as shown in Figure 11.
Power
Figure 11. Relay Signal Connection Example for Form A Relays
Input Isolation Circuitry
The optocouplers optically isolate the NI 6520/6521 digital input channels.
Each IC has an optocoupler that provides optical isolation for one channel
of input.
Output Isolation Circuitry
The electromechanical relays provide isolation on the NI 6520/6521 output
channels. Each relay provides isolation at one channel of output.
NI 6520 Isolation Voltages
The terminals of each I/O channel are isolated from other I/O channels,
from the connector shell, and digital ground. Isolation barriers provide
isolation up to 30 Vrms/42.4 V
except between the two terminals making up a single digital I/O channel.
P1.X COM
P1.X NO
Load
/60 VDC between any two terminals,
pk
17
NI 6520/6521 User Guide
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