Mitsubishi FX3U-232-BD User Manual page 482

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FX Series PLC User's Manual - Data Communication Edition

Non-Protocol Communication (RS/RS2 Instruction)

Important Points in Creating Programs

1) RS instruction can be used as many times as necessary in a program, but make sure that only one RS

instruction is driven at a time.

For multiple RS instructions to be driven, make sure the OFF time is longer than one scan time.

or more between completion of sending and the start of receiving or between completion of receiving and

the start of sending.

PLCs (whose version is before Ver. 2.00), provide an interval of 100 µs or more.

(whose version is Ver. 2.00 or later), FX

3) While RS instruction is being driven, change of D8120 is prohibited.

To change D8120, set RS instruction to OFF, set D8120 to "0", and then set a new value to D8120.

4) In the interlink mode, set the amount of received data n to "31" or more.

If it is set to "30" or less, the control line ER (DTR) is set to OFF as soon as the PLC receives data. As a

result, the received data may be partially skipped.

5) Do not use another instruction which uses the same communication port. If such an instruction is used,

communication may not function normally.

Communication Error

When a communication error occurs, the error flag M8063 turns ON and D8063 stores the error code.

PLCs: RS2 instruction, IVDR instruction, etc.

PLCs: EXTR instruction

Parity error, overrun error or framing error

PLCs, make sure to provide an interval of two scan times

→ Confirm the contents in "Chapter 11. Troubleshooting".

6 Creating Programs (RS Instruction)

6.4 Important Points in Creating Programs

PLCs, this interval is not

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