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Guest Griswald

Can Anyone help? Please?

9 posts in this topic

We are using Medoc ver2.4 and have made up a cable as sergei posted.We are trying to communicate with a FX0s-10mr-es. No luck so far! Can anyone guide us through as we are absolute beginners and getting very frustrated!

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Hi, What have you set the comm port options to? Should be 9600baud, 7 data bits, even parity, 1 stop bit. Have not yet seen the posted cable. But should convert rs232 interface from pc to rs 485 on plc side.

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The cable, as posted by me, will not work with FX0,FX0S. But try this: http://forums.mrplc.com/index.php?showtopic=3749

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Thanks guys but we are still not getting anywhere! We have now made up the cable as suggested by Sergei. All settings are as above apart from flow control? Any suggestions? I guess once we have solved this we just plug in the cable set the plc to stop and run medoc then we should be able to see the program and make changes? Any help would be greatly appreciated!

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did you check if you serial port is really functional and available (not used by other application)? did you try to open it using some other application (Hyperterminal?)

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Once again: "the cable as suggested by Sergei" does not work with FX0S. Also, not understood about stopping the PLC and switching to Medoc. Explain, please! Edited by Sergei Troizky

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Just to explain, we have made up the cable suggested by Sergei (via the link he so kindly posted!) We have plugged in the cable to the plc and switched it to stop (on the plc). The plc is powered by the mains 240V ac. The other end of the cable is plugged in to the serial port of the pc. We are running Medoc ver2.4. When we try to transfer to/from the plc it does not work, the pc does not acknowledge that anything is plugged in as far as we can tell! If anyone can suggest what we are doing wrong we would be very grateful!

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Once again, the fx0s uses a rs485 interface. you will need to convert your pc interface (rs232) to an interface the plc can communicate on. use a rs232 <-> rs485 converter. if this does not work, buy a sc09 cable.

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The PLC ability to communicate does not depend on its Run/Stop status, unless the ladder program includes RX/TX instructions. There is also one important issue for AC powered Mitsubishi PLCs. The PC and the PLC must be powered from the same AC phase, otherwise the hardware may be damaged. SC-09 cable manual calls this a "phase conflict". Edited by Sergei Troizky

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