What type of connections do I have to make to the pins of PCI 619 DAQ card? Do I have to give the ground and the Vcc on the pins of the connector myself? What should be the value of the Vcc that I need to give tot he pin?

[John_P1]

Hi Shafin,

So it sounds like you don't have the option to connect your load in the way that I told you to in my previous post (since it is powered from the same 24V supply it must be referenced to GND).  The 6519 is probably not the ideal card, but you should still be able to get this to work.  It requires external resistors, but the following connection should do the trick:

   

When the line on the 6519 is driven low, current is sunk through the 6519 and all of the voltage is dropped across the pull-up resistor.

When the line on the 6519 is high (left floating), the 6519 does not sink any current and the voltage is divided between your pull-up resistor and your load.

Choosing the value of the resistor is important.  From the specifications I found for your controller, the input current required is 5.5 mA @ 24 V.  Assuming a resistive load, let's say the load is about 4.36 kOhms.  The maximum current for the 6519 depends on a number of circumstances detailed in the specifications, but let's assume we want to keep it under 100 mA.  The minimum voltage required on the 24V input to register as a logic high is 15V according to the other specifications page I found for your load.

So, the minimum value of the pull-up resistor should be 240 Ohms in order to avoid drawing over 100 mA when driving the line low on the 6519.  Using a 240 Ohm resistor should drop the voltage as seen across the load to about 22.75 V, assuming a ~4.36 kOhm impedance.

The maximum value of the pull-up would be about 2.6k, assuming your load is purely resistive and is about 4.36kOhms.  This would still provide the 15V across the load with the above assumptions.

Keep in mind I have made quite a few assumptions since I don't know the specifics about the I/O of the DSQC 327.  I'd start with a 1kOhm pull-up and go from there.

Best Regards,

[Shafin]

Hi,

Okay i will try this technique tomorrow. So should i just connect the single wire input of the robot to the pin i am setting low? And make the rest of the connections as shown?

[John_P1 · Accepted solution]

Connect the output of the 6519 to the input on the robot.

The output and ground of the supply should be connected to the VCC and GND of the 6519 respectively.  This should be the same 24V supply that is powering the robot.

Place a resistor between VCC and each output pin on the 6519 that you plan on using.  As mentioned in my previous post, I would try starting out with a ~1k resistor.

Best Regards,

[Shafin]

BRAVO!!!!!!!!!

THANKYOU. THAT HELPED ALOT.