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  1. FX3U and 2x 485adp-mb

    Hoping this is an easy one.... I have an FX3U-80 with 2x 485adp-mb cards on the side. The intention is for one to be a slave and the other a master to read from a slave.  I have successfully got CH2 (the outer card) working as a slave so no issues there. However I seem to be hitting a few speed bumps (OK, road blocks) with using CH1 as a Modbus master. The last time I did this was with an IEC program and Q series- so I could use the intelligent module setup window. This time I am using basic ladder and an FX3U. I only want to read about 6 registers from the salve device and can set its node address to whatever I like, but typically I'd use 2. Does anyone have an example code to hand they could pop up?  Here is what I've got so far in relation to the master..... pretty much taken from the "Modbus Serial Communication Edition" FX3 manual. Now there is a chance (admittedly a pretty good one) that I'm being thick as pig poop as I am not currently connected to an actual slave device, instead I have the port plugged into a 485 converter and have been using modscan32 on my laptop- this reads from my slave port perfectly.  I was hoping to see some or any comms/ flashing SD or RD lights this way. I will be hooking up to the actual device tomorrow so maybe it'll come to life.... or not?! Thanks in advance. If I manage to sort it myself in the meantime I will post up and hopefully highlight the solution/ issue.   
  2. FX3U-485ADP-MB Problem need help

    I have got a FX3U-16M and -32M PLC and trying to connect with Moxa NPort 5130A serial device server to work with a scada.  It seems that i dont get the modbus to communicate.  I have tried the 110 ohm, 330 ohm and open setting on the device.  I am making use of a 2 wire system. I have configured both the channel 1 and channel 2 of the PLC to work with MODBUS 485. i have written a program like follow M8411    ----------- Move H1087 D8400                  ----------- Move H1 D8401                  ----------- Move K2000 D8409                  ----------- Move K400 D8410                  ----------- Move K10 D8411                  ----------- Move K3 D8412                  ----------- Move H1 D8415                  ----------- Move K100 D8416 I just need to test if there is communication from these cards.  i have got 15 cards to test. Any other help will also be appreciated.