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4 SERIAL COMMUNICATION FB
4.2 M+FX5UCPU-SerialComm_Input
Timing chart of I/O signals [When the operation is completed with an error]
Module error (Serial communication error) <ch1 example>
Restrictions or precautions • This FB does not include the error recovery processing. Program the error recovery processing separately in accordance
with the required system operation.
• This FB cannot be used in an interrupt program.
• This FB uses the serial communication (RS2) instruction.
• Do not use this FB in programs that are executed only once, such as a subroutine program or FOR-NEXT loop, because
i_bEN (Execution command) cannot be turned off and the normal operation cannot be acquired. Always use this FB in
programs that can turn off i_bEN (Execution command).
• When switching the "M+FX5UCPU-SerialComm_InputOutput" FB, "M+FX5UCPU-SerialComm_Input" FB (this FB),
"M+FX5UCPU-SerialComm_Output" FB, and RS2 instruction using the same communication channel, turn OFF unused
target FBs and RS2 instruction for at least 1 scan.
• This FB uses the index register Z9. When using an interrupt program, do not use this index register in the interrupt program.
• When using an interrupt program, use the DI/EI instruction before and after executing this FB so that this FB is executed in
the interrupt disabled status. If executing this FB in the interrupt enabled status, a self-diagnosis error that occurs in an
interrupt program is detected as an error that occurred in the FB.
• The following FB does not support full-duplex bi-directional communication, interlink mode, communication using control
line. To perform full-duplex bi-directional communication, interlink mode, communication using control line, please use
"M+FX5UCPU-SerialComm_InputOutput" FB.
- M+FX5UCPU-SerialComm_Input (this FB)
- M+FX5UCPU-SerialComm_Output
• Turn off i_bEN (Execution command) after o_bOK (Normal completion) or o_bErr (Error completion) is turned on. By turning
off i_bEN (Execution command), o_bOK (Normal completion) and o_bErr (Error completion) are turned off.
• This FB can receive data only once. To receive the next data, restart the FB after the previous receiving is completed.
• Receiving complete flag of the corresponding channel (SM8562, SM8572, SM8582, and SM8592) are reset after one
operation cycle. Receive the data of o_uRecvDataLength (Number of receive data points) and o_uRecvData (Receive data
storage device) within one operation cycle.
• Set the module parameters of the used communication channel in GX Works3 in accordance with the application. For the
module parameter setting method, refer to the MELSEC iQ-F FX5 User's Manual (Serial Communication).
• Restart this FB to allow changes to the number of allowable receive data points.
• FX5UC CPU does not have serial communication port ch2. When using this FB in FX5UC CPU, set a channel of one of ch1,
ch3, ch4.
• This FB does not support the SM/SD devices of FX3 series compatibility. When using this FB in communication channel ch1
or ch2, set the SM/SD devices of FX3 series compatibility of the module parameters of the used communication channel in
GX Works3 to "Disable."
Item Description
i_bEN
o_bENO
Receiving
0H Error code
Serial data transfer
SM8500 (ch1 communication error)
o_bOK
o_bErr
o_uErrId
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