Power-On And Power-Off Conditions; Relay Signal Connection Example - 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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NI 6520/6521 User Guide
The maximum power rating for the NI PXI-6521 relays
(NI PXI-6521 Only)
is 60 W or 60 VA, with a maximum current of 2 A for all channels from 0 to
55 °C, external PXI chassis ambient.
(NI PCI-6521 Only)
The maximum power rating for the NI PCI-6521 relays is
60 W or 60 VA. Figure 9 demonstrates the maximum current ratings for the
NI PCI-6521 relays from 0 to 55 °C.
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
Figure 9. NI PCI-6521 Relay Power Ratings
Power-On and Power-Off Conditions
The relays on the NI 6520/6521 have the default statuses of deenergized
(control bit is low) in both power-on and power-off states. For more
information on default states of the NI 6520/6521 relays, refer to the
Programmable Power-Up States
section.
Relay Signal Connection Example
To connect to the NI 6520/6521 signals for Form C relays, connect NC,
NO, and COM, as shown in Figure 10.
Power
Load A
Figure 10. Relay Signal Connection Example for Form C Relays
5
10
15
20
25
30
Ambient Temperature (°C)
External PC Ambient—All Channels
section and the
P1.X COM
P1.X NC
P1.X NO
Load B
16
35
40
45
50
55
Non-Latching Relays
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