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The NI 6521 is designed to meet the requirements of UL/IEC 61010-1 and
is UL listed.
Refer to the driver software documentation for configuration instructions.
After the NI 6520/6521 device and the driver software are installed, the
DAQ device appears under the Devices and Interfaces branch of the MAX
configuration tree.
If the DAQ device does not appear in MAX, use the following
troubleshooting guidelines.
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•
•
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Functional Overview
Figure 1 illustrates the key functional components of the NI 6520/6521
device.
8 Digital
Photocouplers
Inputs
8 Digital
Relays
Outputs
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Verify that you are using the correct version of NI-DAQ
(NI-DAQmx 7.5 or later). To download the most recent National
Instruments drivers, go to
ni.com/drivers
Press <F5> to refresh the MAX window, or close and re-open MAX.
Reboot the computer.
Power off and unplug the computer or chassis, and install the device in
a different slot. Refer to the DAQ Getting Started Guide for installation
instructions and safety guidelines.
10 MHz
Clock
Industrial Digital
I/O Control FPGA
Programmable
Power-Up States
Watchdog Timer
Change
Digital
Detection
Filtering
Figure 1. NI 6520/6521 Block Diagram
3
.
Flash
Memory
PCI Bus
Data/Control
Data/Control
Interface
Configur ation
Control
NI 6520/6521 User Guide
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