adccommunitymod (AutomationDirect) asked a question.
Created Date: February 11,2011
Created By: keklon
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Hello, I'm hoping to get a little advice on a analog module (F0-02AD2DA-2) I am using for my speed follower application. For now I am using Up/Down Counter set up in HSIO mode 20 to track my back log. I have programed comparative contacts to load a count in V-2010 to represent the voltage level I want output to the analog out. I cant seem to get a measurable voltage at the analog out. Can I measure it with a DVOM and do I need to put a load on it? The user manual lists 2Kohm min. load for the output. I would like to verify the output before I connect it to the VFD. I have DirectSoft programing software and can see the values change for v2010. Thanks Keklon
Created Date: February 11,2011
Created by: KPrice
keklon, yes, you should be able to connect a DVOM to the output and measure the voltage. The DVOM meter is putting a load on the output, granted the DVOM has very high input impedance. Check your data formatting, number of channels, format, pointers. I 've been caught on this before. If you had to edit the formatting instruction (and using a SP0 to trigger the instruction), make sure you do a program/run transition.
Created Date: February 11,2011
Created by: keklon
analog format
KPrice, Thanks for the reply. I will list my format on SP0. LD K202, OUT V700, LDA O2010, OUT V702. Then to output a voltage I LD a value (K0 to K4095) into V2010. Is this correct?
Created Date: February 11,2011
Created by: KPrice
keklon, you are setting up for 2 BCD Inputs, 2 BCD Outputs, in slot 1 (left-most slot) in DL06, correct? Since you have 2 BCD Inputs, you need to load an octal address for input also (LDA O2000, OUT V701 for example). Then a program/run transition. Then K0 to K4095 BCD in V2010 should output voltage to channel 1 (assuming module is good). The jumpers would set the voltages. Is this all correct? What are your jumpers? Do you have good 24VDC to the module?
Created Date: February 11,2011
Created by: keklon
KPrice, Yes I am set up in the left most slot of a DL06. I left the office for the day so I will modify the ladder on Monday to address the 2 inputs and other output. I set the 4 jumpers (open)for 10v and the module is new so I hope its still good. Can I assume that I need to select an address for inputs even when they are not being used?
Created Date: February 14,2011
Created by: KPrice
keklon, when you "LD K202, OUT V700 ", you are enabling (2) BCD inputs and (2) BCD outputs. The reason I suggested "LDA O2000, OUT V701 " is so you know where the input data will be stored, even if that value is zero (or other value from noise). If you do not assign a V-memory (V2000 for example), whatever V-memory happens to be in V701, will be over-written with zeros. If a V-memory location is in V701 that you are trying to use in your program, it will be over-written. This would be hard to trouble-shoot. Hope this helps.
Created Date: February 11,2011
Created by: keklon
Hello, I'm hoping to get a little advice on a analog module (F0-02AD2DA-2) I am using for my speed follower application. For now I am using Up/Down Counter set up in HSIO mode 20 to track my back log. I have programed comparative contacts to load a count in V-2010 to represent the voltage level I want output to the analog out. I cant seem to get a measurable voltage at the analog out. Can I measure it with a DVOM and do I need to put a load on it? The user manual lists 2Kohm min. load for the output. I would like to verify the output before I connect it to the VFD. I have DirectSoft programing software and can see the values change for v2010. Thanks Keklon