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App. - 37 App. - 37
MELSEC-Q
APPENDIX
Appendix 9.4 When receiving data using nonprocedural or bidirectional protocol
The following program example receives data under the nonprocedural protocol (or
bidirectional protocol) using the REMFR instruction and I/O signals.
Refer to Chapter 6 for the communication using the nonprocedural protocol.
Refer to Chapter 7 for the communication using the bidirectional protocol.
Refer to Chapter 11 of the User's Manual (Application) for data communication using
the user frames.
(1) Program conditions
The following program receives data from the external device by communication
using the nonprocedural protocol, then turns ON the receive read request signal
(X1003), and reads the received data from the QJ71C24N buffer memory to the
PLC CPU.
(a) Devices used
:
• Error code read signal ............................................................ X1023
• Receive read request signal................................................... M10
• Received data acquisition command ..................................... M11
• Receive result acquisition command...................................... M12
• Completion device for REMFR instruction............................. M100 to 105
• Normal/abnormal completion flag for REMFR instruction..... M200 to 203
• Normal/abnormal completion of receive ................................ M300, M301
• Received data count ............................................................... D0
• Received data (when 5-word data are received)................... D1 to D5
• Data reception result............................................................... D8000
(b) Intelligent function module switch settings (Refer to Section 4.5.2)
Bit
Switch No.
Position Designated value
Description
Setting
value
b0 OFF Operation setting Independent
b1 OFF Data bit 7 bits
b2 OFF Parity bit No
b3 OFF Even/odd parity Odd
b4 OFF Stop bit 1 bit
b5 OFF Sum check code No
b6 ON Write during RUN Enabled
b7 ON
Transmission
setting
Setting modifications Enabled
Switch 1
b8 to b15 — Communication rate setting 19200bps
07C0
H
Switch 2 — Communication protocol setting Non-procedure protocol 0006
H
Switch 5 — Station number setting Station 0 0000
H
(c) Buffer memory settings used in this example
Address Decimal (Hexadecimal)
CH1
Name
Setting
value
150 (96
H
) Word/byte units designation Word units
164 (A4
H
) Received data count designation 01FF
H
165 (A5
H
) Receive complete code designation 0D0A
H
166 (A6
H
) Receive buffer memory head address designation 0600
H
167 (A7
H
) Receive buffer memory length designation 0200
H
600 (258
H
) Data reception result —