Unable to read analog signal

3 posts in this topic

PLC:- FX3u-48MR

Analog card:- Fx2n 2AD

Signal source:- 4-20mA Signal generator


rd3A Command

Tried TO & FROM Command

PLC doesnot read the signal, yet no error, wired as per manual...

Please suggest if anyone has answer to this problem?

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@vtripathi How about your wiring and which module do you connect? Please show us your program for check.

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Hi Wasan


thanks for the reply 


i tried 2 different modules


Module 1:- FX3U-4AD-ADP, It is connected on left hand side of plc


This Analog module is connected to expansion board bolted to mitsubishi plc


Expansion board:- FX3U-CNV-BD

I am using a signal generator to generate 4-20mA signal


Connecting +Ve to V+

Bridging link between V+ and I+

Connecting Comm to -Ve


program attached


Second method was using FX2N 2AD, which connects on right hand side of the fx3u plc via ribbon cable, 

Please find screen shots of plc attached to word file as attachment

Hope to hear soon from you

Best Regards,







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