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Analog threshold trigger

Created by: paulusB at: 2/27/2018 4:03 PM (9 Replies)

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2/27/2018 4:03 PM	Rate (0)
paulusB Posts: 12 Rating: (0)	I have an existing program which is controlling two pumps based on a analog input. Normally we determine the threshold values when installing the system. Now our customer want to control the threshold values using Modbus TCP. I already figured out that we can configure the LOGO as a client and that it is possible to set up a data transfer table. The threshold values then come from the server with by means of a Analog Flag. But how do I transfer these AM in the threshold? Attachment printscreen threshold values.JPG (412 Downloads)
paulusB Posts: 12 Rating: (0)
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2/27/2018 4:19 PM	Rate (1)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 11/2/2024 Posts: 34125 Rating: (4249)	Although it is possible to write the setpoint for the threshold trigger in analog markers, I would personally not do it. I would write in words of the VM area. This is just another register for Modbus. Attached but a possible solution with the analog flag. Edit: But please keep in mind: The LOGO! can only integers, so fixed points from -32768 to 32767. Attachment Unknown.PNG (463 Downloads)
	Last edited by: ixo65 at: 2/27/2018 4:22:46 PM
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This contribution was helpful to 2 thankful Users RKBIS DKYNDT2

2/27/2018 4:40 PM	Rate (0)
paulusB Posts: 12 Rating: (0)	Ok thanks for your quick reply. I'm relative new with LOGO where do I find the VW entries?
paulusB Posts: 12 Rating: (0)
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2/27/2018 4:55 PM	Rate (2)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 11/2/2024 Posts: 34125 Rating: (4249)	You have to write on the Modbus side in a holding register and then read the appropriate word from the VM area as an analog network input. Edit: Please note: You have to make in the LOGO! a Modbus TCP/IP connection to the Modbus device. A connection list will be created for this connection. In this connection list you must then enter the appropriate values. Attachment Unknown.PNG (361 Downloads)
	Last edited by: ixo65 at: 2/27/2018 5:00:38 PM
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This contribution was helpful to 1 thankful Users RKBIS

3/13/2018 10:01 AM	Rate (0)
paulusB Posts: 12 Rating: (0)	Didn't work on the program for several weeks. I thougt I understood the function but I still don't understand how to write the VW in the threshold. I made a test program with an potmeter. Normally the output is on by setpoint 500. Now I wan't to change this setpoint remotely Attachment Knipsel.JPG (379 Downloads)
paulusB Posts: 12 Rating: (0)
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3/13/2018 10:10 AM	Rate (2)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 11/2/2024 Posts: 34125 Rating: (4249)	Not by means of the block "Analog network input", but via the "Parameter VM mapping". Tools > Parameter VM Mapping Attachment Unknown.PNG (379 Downloads)

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3/13/2018 10:13 AM	Rate (0)
paulusB Posts: 12 Rating: (0)	Made a test with a normal analoge input (see attachement) and this works so it should also work with a network analoge input Attachment Knipsel.JPG (367 Downloads)
paulusB Posts: 12 Rating: (0)
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3/13/2018 10:16 AM	Rate (1)
ixo65 Grandmaster-Expert Joined: 12/18/2014 Last visit: 11/2/2024 Posts: 34125 Rating: (4249)	Yes, it works also. But you must use more blocks. If the programm is larger, you need every free block.

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This contribution was helpful to 1 thankful Users RKBIS

3/13/2018 10:19 AM	Rate (0)
paulusB Posts: 12 Rating: (0)	aha, thanks
paulusB Posts: 12 Rating: (0)
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This contribution was helpful to 1 thankful Users ixo65

3/14/2018 9:47 AM	Rate (0)
Jen_Moderator Diamond Member Joined: 6/19/2017 Last visit: 9/6/2024 Posts: 8175 Rating: (172)	New question published by paulusB is split to a separate thread with the subject Modbus tester for LOGO! as Modbus server. Best regards Jen_Moderator

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