4/24/2010 8:55 AM | |
Joined: 5/28/2008 Last visit: 11/6/2024 Posts: 4516 Rating: (839)
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Hello, Please revise your wiring in according to the attched manual of the AI/O module. Also have a look on the following thread. I am sure it will help you. /tf/WW/en/Posts/26057 Regards, Attachment6ES7334-0CE01-0AA0.pdf (807 Downloads) |
Ayman Elotaify |
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4/25/2010 1:31 AM | |
Joined: 7/2/2008 Last visit: 9/30/2024 Posts: 928 Rating: (309)
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Hello AhmetTan,No, it is not normal. The mA that gives 4096 = (4096/27648)*20 = 2.96 mA which means that your signal conditioner gives an outputstarting from3mA. Did you measure the output currentof the signal conditioner? If the output of signal conditioner is 4 to 20 mA then you can't use FC105. I hope you are referring to the same manual I'm referring to in which (page 200) you can find the representation of 0 to 20mA. 0 mA will give you 0 and 20mA will give you 27648. Remember that the representations there are for the analog modules not for sensors. I mean your module will always follow the 0 to 20mA representation despite the fact that you have 4 to 20mA signal. Now this is correct. mA= (5760/27648)*20 = 4.16 mA which is correct. Now you should make your own scaling function because you will always have an offset of 4mA. I'll give you an example. If you have a 4-20 mA pressuretransmitter that gives 20mA at50 Bar. So,when you get avalue of25 Bar, the current output should be 12 mA. 1- Fromthe 4 to 20 mA transmitter side, you have 50% (8mA) of current range which is 16 mA(20-4). You add 8mA to 4mA so you get 12mA. 2- From the 0 to 20 mA SM334 side, The module is reading 12mA which represents 60% of its range (20-0) The represented decimal value of the module will be 16589 (0.6*27648) When you use FC105, you will get30Bar although you expect to get 25 Bar. I hope youwould forgive my poor explanation and I hope that you understood what I wanted to say. Best regards. H-H |
1/26/2015 11:55 AM | |
Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4766 Rating: (122) |
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