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4 SERIAL COMMUNICATION FB
4.4 M+FX5UCPU-SerialComm_ExeCommonProtocol
■Output label
■Public label
*1 Even if a serial communication error occurs in the used communication channel, error completion and error code are not output and the
FB does not stop. Use a user program to detect the error. For serial communication error and serial communication error code, refer to
the following manual.
MELSEC iQ-F FX5 User's Manual (Serial Communication)
FB details
No. Variable name Name Data type Default value Description
(6) o_bENO Execution status Bit OFF ON: The execution command is on.
OFF: The execution command is off.
(7) o_bOK Normal completion Bit OFF When this bit is ON, it indicates that data communication
is completed normally.
(8) o_bErr Error completion Bit OFF When this label is ON, it indicates that an error has
occurred in the FB.
(9) o_uErrId Error code Word [Unsigned] 0 Stores the error code that occurred in the FB.
(10) o_uNumberOfExecutions Number of protocol
executions
Word [Unsigned] 0 The number of protocol executions is stored. The
protocol in which an error has occurred is included in the
number of executions. If the setting data and the setting
details of the control data are incorrect, 0 is stored.
(11) o_uMatchPacketNo Matched receive
packet number
Word [Unsigned]
(0..7)
0 1st word: Matched receive packet No. 1
8th word: Matched receive packet No. 8
A value is stored in the area corresponding to the
execution protocol number. When the communication
type of the executed protocol is "Send only" or "Send
and receive", the receive packet number that matches
with the executed protocol, is stored.
In the following cases, 0 is stored.
• When the communication type is "Receive only"
• When an error occurs in the executed protocol
• The area is greater than or equal to the number of
protocol executions
When it is specified using a label, use "ARRAY" for the
data type.
No. Variable name Name Data type Range Description
(12) pb_bSerialComErrUndetection Serial communication
error undetection
mode
Bit ON, OFF ON: FB does not detect serial communication error.
*1
OFF: FB detects serial communication error.
Item Description
Available device CPU module FX5U CPU (Version 1.015 or later), FX5UC CPU (Version 1.015 or later)
Engineering tool GX Works3 Version 1.015R or later
Language Ladder diagram
Number of basic steps 216 steps
The number of FB steps integrated in the program varies depending on the CPU module used, the input/output definition, and
the setting options of GX Works3. For the setting options of GX Works3, refer to GX Works3 Operating Manual.
Processing • Executes the registered protocol by the communication protocol support function (predefined protocol support function) on
GX Works3 using the communication protocol support (SP.CPRTCL) instruction, by turning i_bEN (Execution command) on.
After executing the protocols specified with i_uExeProtocolNo (Execution protocol number) and i_uNumberOfExecutions
(Number of consecutively-executed protocols), o_bOK (Normal completion) turns on.
• This FB checks the following input values when started up. If an error occurs, o_bErr (Error completion) turns on, and
o_uErrId (Error code) stores the error code.
(1) Communication channel
(2) Number of consecutive protocol executions
• If an error occurs during data communication processing, o_bErr (Error completion) turns on, and the serial communication
error code is stored to o_uErrId (Error code). For the error code, refer to Page 32 Error code. When
pb_bSerialComErrUndetection (Serial communication error undetection mode) is turned on by a user program, this FB does
not detect serial communication errors for error codes 7F67H to 7F6AH (the FB continues to operate). Detect serial
communication errors using a user program.
FB compilation method Macro type
FB operation Pulsed execution (multiple scan execution type)
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