I can't write holding registers
hay My program mast visualize some data of a controller. This with an Ethernet connection. I can read everything and I can write coils bet I cant write the holding registers. I hope someone can help? Heir my VI: Rutte
Solved!
Go to Solution.
Attachments:
Master.zip 824 KB
Thanks for the Flat sequences tip. And for clean up my mess JI think the data must be 16 bit integer because I can read it with 16 bit integer.I also think that the values must fit into 2 consecutive modbus registers. Because when I read it fits. Now I have typecast the data ant I have convert it to I16. bet it didn’t work. What do you mien with split/join numbers?
Attachments:
holding registers.doc 40 KB
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How can i write and read the same data
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[email protected]
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dileep.vi 93 KBThe easiest way to perform a certain action (such as file I/O) based on a certain condition (such as whether a value has passed a certain threshold) is to use a comparison VI in combination with a case structure. Then you can specify that if your rms, standard deviation and variance are above a threshold then perform a certain action.
Also consider using shift registers to keep track of data from the last loop. If I understand you correctly, you want to start logging data when an upper threshold has been passed. Then you want to continue logging data until a lower threshold is passed. I have attached a non-functional but explanatory VI that will help explain how to implement logic to that effect. It also demonstrates that you can indeed write and read from the same file in a loop. The best way to do this is to open the file before the loop, do all the necessary writing and reading in the loop, and then close the file after the loop.
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I used the same method you are starting right now, i conencted the NI9871 to the rs485 adapter given by the supplier and tried sending and reading my own signals.
After much hassle and some changes to your (and my) initial vi setup as shown in your first post, everything worked out fine:
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1. I used the NI modbus VIs, but it worked as well with the normal visa commands and building the modbus command on your own, but way easier with the NI VIs.
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I changed the connection of the Rx+/Tx+ and Rx-/Tx- around, basically connecting the 2wire sensor the other way around the manufacturer said it should be connected to the master device.
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