RoboRealm Forum

No Title

Tue, 30 Nov 1999 00:11:00 EST

Hello,

I'm currently working in RR v2.30.8. I have tested the program.robo file. I can read the holding register values with a modbus master -->screen1. But it is not possible to write(change) those values. I get no exception. When I write to a address that is not mapped to a value it creates non existing variables. (| 20380141 )--> screen2.

No Title

Tue, 30 Nov 1999 00:11:00 EST

Willie,

Thanks for such great information and debugging! It indeed looks like the FC_PRESET_MULTIPLE_REGISTERS function was incorrectly updating input registers as the log was indicating. As your variable is mapped to a holding register nothing was getting updated. We corrected this to now update the holding register instead of an input register. Note that this also affected the FC_PRESET_READ_MULTIPLE_REGISTERS function that was also pointing incorrectly to input registers.

Please download 2.5.5 for that fix and let us know if it does the job!

Thanks,
STeven.

Modbus slave problem

Tue, 30 Nov 1999 00:11:00 EST

Hi Steven,
I have been testing the Modbus slave functionality and there seems to be a bug in the works. When I use a Modbus master to read variables (mapped to holding registers which by definition are read/write) from RR everything works as it should. I have declared a dummy variable which I am trying to modify from the Modbus master. RR then states that a Input Register (by def. Read only) has been written but the variable is left unchanged. I have tried different MB masters all with the same result although some display exception errors on receipt of the response to the write request (Modbus request 16). I normally use Modscan as a testing master. I have attached the .robo file. If I write multiple coils all coils accept the change, except for the coil that are linked to the variable mb_trig . (MBcoil.robo)