5i25 + 2 X 7i74
16 Jun 2016 11:42 #76151
by andypugh
Replied by andypugh on topic 5i25 + 2 X 7i74
What happens if you just swap the cables over? That will indicate if the problem is with the 7i74 port setup or the 7i84 setup.
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16 Jun 2016 11:47 #76152
by terkaa
Replied by terkaa on topic 5i25 + 2 X 7i74
Hi,
I have two 7i84 another is connected to Port_0 I tried swapping units and tried another CAT6 cable. No go... I have 5V power supply for this non working 7i84. Could that cause issues? Manual says 5V field power should be ok.
Tero
I have two 7i84 another is connected to Port_0 I tried swapping units and tried another CAT6 cable. No go... I have 5V power supply for this non working 7i84. Could that cause issues? Manual says 5V field power should be ok.
Tero
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16 Jun 2016 11:54 #76154
by terkaa
Replied by terkaa on topic 5i25 + 2 X 7i74
Hi,
Yes that is the issue swapping to 24V field power makes this card work. I have a problem now. This card was supposed to interface MPG and user panel leds (5 volts for both). I measured voltage with Fluke and it was 5.2 volts. Power source is good quality TDK Lambda with 5V/1.5A
Yes that is the issue swapping to 24V field power makes this card work. I have a problem now. This card was supposed to interface MPG and user panel leds (5 volts for both). I measured voltage with Fluke and it was 5.2 volts. Power source is good quality TDK Lambda with 5V/1.5A
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16 Jun 2016 12:15 #76155
by andypugh
That's not a problem. When you put the 7i84 into Mode 3 the threshold voltage of the MPG input pins is automatically set to 2.5V to suit 5V MPG encoders.
I have 5V MPGs and 24V GPIO mixed on my own 7i84 and it works perfectly.
Replied by andypugh on topic 5i25 + 2 X 7i74
Yes that is the issue swapping to 24V field power makes this card work. I have a problem now. This card was supposed to interface MPG and user panel leds (5 volts for both).
That's not a problem. When you put the 7i84 into Mode 3 the threshold voltage of the MPG input pins is automatically set to 2.5V to suit 5V MPG encoders.
I have 5V MPGs and 24V GPIO mixed on my own 7i84 and it works perfectly.
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16 Jun 2016 12:27 - 16 Jun 2016 12:34 #76159
by terkaa
Replied by terkaa on topic 5i25 + 2 X 7i74
Hi,
Ok but I just spent couple of hours soldering 330omh resistors to led wires.... Now I would have to do that again with 4.7Kohm resistors.... I am wondering why it does not work with 5V ? Well time well waisted I guess. Below is a page from 7i84 manual, is it a misprint?
Tero
Ok but I just spent couple of hours soldering 330omh resistors to led wires.... Now I would have to do that again with 4.7Kohm resistors.... I am wondering why it does not work with 5V ? Well time well waisted I guess. Below is a page from 7i84 manual, is it a misprint?
Tero
Last edit: 16 Jun 2016 12:34 by terkaa.
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16 Jun 2016 12:47 #76161
by andypugh
Replied by andypugh on topic 5i25 + 2 X 7i74
I think your problem is that Logic Power is 8 to 32V. To use 5V GPIO you would need a separate 8V supply to VIN.
You shouldn't need any resistors, you can power the MPG from 5V and connect it to a 7i84 in MPG mode regardless of what field voltage the other IO is using.
You shouldn't need any resistors, you can power the MPG from 5V and connect it to a 7i84 in MPG mode regardless of what field voltage the other IO is using.
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16 Jun 2016 12:49 - 16 Jun 2016 12:50 #76162
by Todd Zuercher
Replied by Todd Zuercher on topic 5i25 + 2 X 7i74
But were you using 5v on the VIN (Pin#5 or W1 in the left)? The 7i84 needs 8-32v to run (it's logic).
Last edit: 16 Jun 2016 12:50 by Todd Zuercher.
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16 Jun 2016 13:16 #76165
by terkaa
Replied by terkaa on topic 5i25 + 2 X 7i74
Andy, Pls read my post again I need +5V for MPG AND user panel leds. Those leds need 330ohm resistors. Todd okay now I see I have to separate Logic VIN from Field Power with W1 jumper that way I can power logic with 24V and use 5V for powering inputs and outputs.
Tero
Tero
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16 Jun 2016 14:05 #76172
by terkaa
Replied by terkaa on topic 5i25 + 2 X 7i74
Ok, now it is done. My next question is are inputs now 5V or 24V? Outputs work and are 5V
Tero
Tero
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16 Jun 2016 14:13 #76173
by andypugh
MPG inputs are always 5V, (2.5 V threshold).
The GPIO inputs adjust threshold to match VFIELD. (But I think that they stay 32V-safe, but check with PCW)
Replied by andypugh on topic 5i25 + 2 X 7i74
Ok, now it is done. My next question is are inputs now 5V or 24V? Outputs work and are 5V
Tero
MPG inputs are always 5V, (2.5 V threshold).
The GPIO inputs adjust threshold to match VFIELD. (But I think that they stay 32V-safe, but check with PCW)
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