4-4 | ni.com
Chapter 4 Power Connections
Optically Isolated Outputs with Darlington Arrays
(NI 6512/6513/6514/6515/6516/6517/6518/6519)
The outputs on the NI 6512/6513/6514/6515/6516/6517/6518/6519 device are optically isolated
photocouplers with Darlington arrays. You can configure the outputs as follows:
• Writing a 1 (logic high) to an output line switches on one channel of the Darlington array
and allows current to pass through the output line.
• Writing a 0 (logic low) to an output line switches off one channel of the Darlington array
and prohibits current from passing through the output line.
•
(NI 6512/6513/6514/6515 only) In order to use the +5 V isolated power lines on Bank 6
or Bank 7, you must connect an external power supply over +8 V on Bank 6 or 7
respectively.
Note The maximum external voltage on these lines is 30 V DC.
Note The power at the I/O connector is derived from the output Vcc
(user-provided). The output Vcc must be greater than 10 V DC to ensure that the
output voltage is in the range of +4.3 V DC to +6.3 V DC
Caution Do not reverse the external voltage polarity or exceed the maximum
output specifications. Doing so could permanently damage the
NI 6512/6513/6514/6515/
6516/6517/6518/6519 device and the power supply if it is not protected.
Power-On and Power-Off Conditions
(NI 6512/6513/6514/6515/6516/6517/6518/6519 only) At power-on and power-off, the
Darlington arrays on these devices switch off.
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