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[Steve Bailey]

Hi Steve,
I have GEFANUC 90-70 PLC, with a PCM711 module configured as Modbus master rtu with MegaBasic connected to two (02) Bently Nevada racks. It was working well retrieving data and storing them into CPU module.
After a power loss , the communication stopped.
Using a hyper terminal , when reading the content of the memory of PCM711, I found only two (02) executable files “FS.exe” and “FH.exe”.
I don’t have the necessary tools to fix this problem as it says in the documentation I need PCOP, TERMF, and a Megabasic file for Modbus configuration.
Could you help ?

Were those the only files? Megabasic files have the suffix .bas

You can probably get along without PCOP. Termf is sufficient to do whatever you need. In fact, you could probably get along with Hyperterm.

 

[Alfred10]

There is another file , Pcmexec.bat which contains the following commands :
Q FH.EXE 0
Q FS.EXE 0
R FH.EXE /B
R FS.EXE
No .bas files.
When I push reset button for less than 5 sec , the led ok blinks , but the communication is not working.

 

[Alfred10]

Were those the only files? Megabasic files have the suffix .bas

You can probably get along without PCOP. Termf is sufficient to do whatever you need. In fact, you could probably get along with Hyperterm.

Is there a Megabasic file sample to read/write Modbus command ?

 

[Steve Bailey]

My error. Megabasic files have the suffix . pgm, not .bas.

The PCM runs the program pcmexec.bat at powerup or soft reset. The .exe files are compiled executables.

The "Q" commands unprotect the FH.exe and FS.exe files so they can be written.
The "R FH.exe /B" command runs FH.exe in the background.
The "R FS.exe" command runs FS.exe

Try connecting a terminal program to the serial port when you do the soft reset and see what characters are being sent out the port.

I don't think I have a Modbus master program in Megabasic.