Mitsubishi plc serial communication protocol

#MITSUBISHI PLC SERIAL COMMUNICATION PROTOCOL CODE#
#MITSUBISHI PLC SERIAL COMMUNICATION PROTOCOL PC#
#MITSUBISHI PLC SERIAL COMMUNICATION PROTOCOL SERIES#
#MITSUBISHI PLC SERIAL COMMUNICATION PROTOCOL WINDOWS#

From this window, click on the DEV001 selection on the tree to the left of the window as shown below. The Panel Manager window opens by default displaying Panel Settings. The drop-down menu shown below opens.ДЇrom the Setup drop-down menu, select the Panel Manager selection. To access the Panel Manager from the C-more Programming Software, from the Main Menu select Setup. Note: Remember to power cycle the PLC after making changes to the communication port settings. The C-more panel is the master when communicating with a Mitsubishi PLC. The parameters in the C-more Panel Manager are also fixed with the exception of the Timeout and Poll Time. The serial communications parameters are fixed for this port, therefore there is no setup in the PLC.

#MITSUBISHI PLC SERIAL COMMUNICATION PROTOCOL SERIES#

The Mitsubishi Melsec FX series PLC's all have a one serial communications port to which the C-more connects. It includes two drivers: Mitsubishi FX-1N(C)/2N(C)/3U(C) (CPU) and Mitsubishi FX Series CPU. This help file includes setup information for the Mitsubishi Melsec FX PLCs. The Mitsubishi CPU types each have specific communication nuances that must be considered. Pay close attention to the configuration details, and limitations provided in this topic. I can imagine that in many situations this would not be an acceptable solution, but I am happy to share it with you in case you can use it.Mitsubishi Melsec FX PLC Setup Information This is all done for hardware that was originally designed before the company that I worked for realised that PC's could not do accurate timings (long before I joined) and all our new hardware has is own timers and buffers, which solves my problem. I think it is a resonable compromise for my system. It is sufficiently accurate for my customers' needs as their signal does not change rapidly.

#MITSUBISHI PLC SERIAL COMMUNICATION PROTOCOL PC#

Obviously if the user runs a new app that uses lots of resources it takes a few seconds to adjust but most of the time they just set the PC off doing an experiment and leave it. I then tweak the timer setting to get the timer correct, until I get the correct number of samples in a given time. I set the timer to the calculated value then at intervals of a few seconds I check the number of samples that I have against the the number I should have, caluculated from the Real Time clock. The Real Time Clock has its own crystal and is not affected by the PC's actions. My solution was to dynamically adjust my timer setting, using the Real Time Clock to check my timer. My customer might well run a 2 hour experiment and that meant the experiment would either take an extra 10 or 20 minutes OR they would have 10 or 20% less points of sample data (depending on how I decided it was finished) - neither situation was acceptable. but on another machine or a few days later if would be wrong! (I guess it depends on ehat processes are running etc) The error could be 10% or 20%. I could 'tweak' the timer setting and get it just right on that PC, on that day. Years ago I calulated the correct timer setting to give me the sampling rate that I needed on a project that records a signal level at set rate, but I found the timer was always slower than I expected. Hhmmm, I am afraid my 'exact' timing is a fudge and may not help you :-O, here's the story. This is my answer to your comment on your original question (I've put it here so that you get notification that I have added a message :) ) I did set my 'communication' thread to have a higher priority that normal and that did increase the speed to some extent, have you tried that? Since only one 'set' of data can be sent or received at anyone time. I have implemented an additional thread, in one project, that performs data collection at 'exact' time intervals and it works moderately well, but I'm not sure it would improve efficiency.

#MITSUBISHI PLC SERIAL COMMUNICATION PROTOCOL CODE#

I have to add a delay into my code which is the minimum the hardware needs, but sometimes the PC delays for far longer and the whole thing becomes very slow.

we use 38400 baud and yet I find collecting even moderate ammounts of data takes some time due to the build up of 'delays'.

#MITSUBISHI PLC SERIAL COMMUNICATION PROTOCOL WINDOWS#

I am sure you are aware that exact timings from the PC are virually impossible because you cannot control the serial port directly, you are relying on Windows to to do it when it has time. I write applications that communicate with the 'outside world' via RS232 and I often have difficulties with timing.

I'm afraid this is not really an answer, more a general sympathetic moan!

Mitsubishi plc serial communication protocol