Solid-State Relay Outputs; Output Channels - National Instruments 6527 User Manual

Chapter 3 Making Signal Connections

Solid-State Relay Outputs

Output Channels

6527 User Manual
On a 6527 device, I/O connector pins 51 through 98, shown in Figure 3-1,
represent the terminals of the solid-state relays.
The output channels of a 6527 device are solid-state relays containing an
LED and two MOSFETs connected together to form a bidirectional switch.
The LH1546 is a solid-state relay. Depending on how the load is connected
to the terminals, an output can either source or sink currents.
Figure 3-5 shows two signal connection examples for driving a load with
these solid-state relays.
+5 V
390
Digital
Logic
+5 V
390
Digital
Logic
Figure 3-5. Signal Connections for Solid-State Relays
6527
LH1546
DIG+
35
DIG–
Isolation
a. Sinking Current
6527
LH1546
DIG+
35
DIG–
Isolation
b. Sourcing Current
3-10
I
f
R
S
+
Load
Supply
–
Isolated
Ground
+
Supply
I
f –
R
S
Load
Isolated
Ground
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