SolidRio

This can be empty and your program will work with only FROM instructions.

You can use 1 channel as a modbus master with 32 slaves and other as a Mitsu Inverter Communication with 16 slaves. I didnt test that, but you can.

What inverters do have? Asking because if its mitsu - you can manage them via mitsu invertor communication and divide them between 2 channels (or use cc-link ie basis if inverters have ethernet).

I understand that. This system only provide parameters indication and failure of equipment will not hurt anything, but its undesirable of course. I would be happy if mitsu have something with 103 protocol, but they dont. Maybe you can advice something? We cant afford Siemens (quite high price for such small system). And i dont know anything about writing of communication drivers. 

Its seems not quite easy... Meanwhile i found cheap plc from russian company "OWEN" (i think you know them) with support of 103 protocol, but i've never worked with them before. i should check compatibility with GOT (which we already have) and their software. 

Hello everyone.  I have 11 Siemens Overcurrent Relay Modules that only can be communicated via IEC 60870-5-103 protocol. I need to make a system that will be gathering information from them (Currents, Voltages, Some discrete signals, etc.). On mitsubishi site i've only found information about 101/104 protocols. Does Mitsubishi have a plc that can be connected via IEC 60870-5-103 protocol? If not, maybe someone knows another plcs that can be connected to those modules (I am already looking on siemens site, but its seems not quite cheap).

Little update on this old topic. Project ended up with CC-Link IE Basis (Thanks to someone in our office who bought FR-A840-E by mistake). In the manual was written that only 6 inverters  can be connected to 1 plc. But accidentally i faced on mitsubishi site notes to new firmware of fx5u (FX5 Firmware 1.110): "Expanded number of CC-Link IE Field Basic slaves (6->16)". I updated plc firmware and CC-Link IE basis inverter connection works flawless. 

So, i tested MODBUS. First, my previous problem was only when some of inverters is offline. I think i have some problem with program sequence or with response time waiting, i will find out. Second, Its seems when you use small amount of commands (IVCK/IVDR etc) - mitsubishi inverter protocol is winning at speed.  I dont know who will win in case full control of inverter (full monitor and control), i will try it when i will have time. MODBUS (in case of Mitsubishi inverters) not so good as i thought at start. Inverters data divided between many ranges of memory and you cant cover that by 1-2 ADPRWs which can only cover 125 points of memory. Because of this amount of telegrams between plc and inverters not that small. And MODBUS master can be only one in one PLC, so you cant divide your Inverters between 485-modules (like mitsubishi protocol).   

I really misscounted number of telegrams (forgot about PU/EXT/NET and Special monitor, and in last version i deleted Voltage part). There is now need to make sequence over them, they are working one after another. Like this - https://prnt.sc/mcrlp1 But i get your point, there is still to many telegram (even if they working) to inverters. With the one or two inverters its works really well, but if its 2+ inverters.... So i will tryout Modbus and will write results here.  Thanks for your response.

I will share FB that i using in this project in this post. I dont need control in this application, only monitoring.  I will try ModbusRTU next week.  List of equipment: nine FR-A840 inverters and FX5U with 2 485 channels. I am using IVDR for writing special monitor parameter type. I want to monitor Temperature in inverter (HF3 - 96). Thanks for your response. FR_BLOCK.gx3

Sorry but i dont fully understand you. As i said, I am using multiple IVCK (read) for each inverter and one IVDR (send). Can you describe it with example? 

I am using the old versions of A/F-800 without Ethernet port.

Hello everyone. When i was working with FX3U and did Inverter communication (Mitsubishi) by 485 (485-BD and 485-ADP) i've faced really slow connection when there was many Inverters (2-3+). Then i was thinking its because low speed of connection 19200 or 38400. Right now i am making project with 9 Inverters and FX5U. Speed 115,200. And still connection really slow (about 2-3 seconds on refresh data from FR). I divided inverters on 2 groups (5 on CPU's-485 and 4 on 485-ADP) - connection improved, but still about 1 sec. In the program i am only taking data (FREQ/CURRENT/VOLTAGE and DIGITAL OUTPUTS) so there is not so many operators that load connection. I need your advice. Can i improve speed of taking data? 

I've found the problem.  i was using this scheme - https://prnt.sc/m7rckj . So i've removed resistors from circuit and it start to work well even if i turn it by fast moves. 

Hello everyone.   I found a cheap encoder S48-8-1000ZT (1000 pulses) and connect him to FX5U's X0 and X1 (2 phase - 1 edge mode, if i can trust manual - it allows me detect all pulses below 200 kHZ frequency). Changed input response time to 10micro-s. I created a program that simply look at this counting and make some math. If i am rotating encoder with fingers slowly - all works great (my mark matches at encoder and 1000 pulses in program), but if i turn it by 1 sharp fast move and then again and again - marks move by half turn at for example at 10000 pulses.  So i need your experience. Whats going wrong? Is plc dont have enough response speed? Or something wrong with encoder? Or with my configuration? I need to use FX5U and encoder at 1500 r/min motor (with another encoder), so i need to test it before going on object.