20
4 SERIAL COMMUNICATION FB
4.1 M+FX5UCPU-SerialComm_InputOutput
Timing chart of I/O signals [When the operation is completed successfully]
<ch1 example>
[When the operation is completed with an error]
FB error (When the send/receive channel number is outside the setting range)
[When the operation is completed with an error]
Module error (Serial communication sending error) <ch1 example>
[When the operation is completed with an error]
Module error (Serial communication receiving error) <ch1 example>
Item Description
i_bEN
Turns OFF after 1 scan time
*1 Sending complete turns OFF when the next sending request is sent.
o_bENO
i_bSendReq
Sending
0H
Receiving
*1
SM8561 (ch1 send request)
o_bSendComp
Serial data transfer
SM8562 (ch1 receive completion)
o_bRecvComp
o_bErr
o_uErrId
i_bEN
o_bENO
i_bSendReq
0H
o_bRecvComp
o_bSendComp
o_bErr
o_uErrId
Error code
i_bEN
Error code
o_bENO
i_bSendReq
Sending
0H
SM8561 (ch1 send completion)
SM8500 (ch1 communication error)
Serial data transfer
o_bErr
o_uErrId
i_bEN
Error code
o_bENO
o_bRecvComp
Receiving
0H
SM8500 (ch1 communication error)
Serial data transfer
o_bErr
o_uErrId
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