Panasonic FP2 User Manual

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Panasonic FP2 User Manual Manual pdf 76 page image

FP2 Serial Data UnitOperation If an Error Occurs6 − 66.2 What To Do If An Error OccursNoteThe I/O numbers are used as examples when the serial data unitis installed in slot 0. The I/O numbers change depending on theslot in which the serial data unit is installed and the number of I/Opoints of the other unit, so check to make sure the I/O numbershave been changed to match the system being used.6.2.3 If Data cannot be Sent or Received with the Serial Data UnitSituationThere is a possibility that a cable is not connected correctly, or the program contents areerroneous. Check the following points.Solution 1If data cannot be sent or received when the serial data unit is being used for the first time,there is a possibility that a cable has not been connected correctly. Check the connectorwiring diagram and use a tester to check for conductivity.If the serial data unit and cables have already been used successfully for communication,and data cannot be sent or received, try the following solutions to correct the problem.Solution 2Is the CPU unit in the RUN mode?If not, switch the operation mode of the CPU unit.Solution 3Do the communication speed and transmission format match those of the externaldevice connected to the serial data unit? Check the communication speed andtransmission format.Solution 4Are the contact numbers used in the program correct?Check the I/O allocation.Solution 5Has the correct slot number been specified with the F150 (READ) and F151 (WRT)instructions in the program?Check the slot number.Solution 6Check the address of the shared memory specified with the F150 (READ) and F151(WRT) instructions in the program and the addresses of the data registers from whichdata is read, and to which data is written.Solution 7Is data being sent and received at the correct procedure?Check the sequence program.