Mitsubishi Electric MELSEC iQ-R Series User Manual page 97

Restrictions and precautions
• The FB does not include the error recovery processing. Prepare the error recovery processing separately to suit the actual
system and the expected operation.
• The FB cannot be used in an interrupt program.
• Using the FB in a program that is to be executed only once, such as a subroutine program or a FOR-NEXT loop, has a
problem where FB_EN (Execution command) can no longer be turned off and normal operation is not possible; always use
the FB in a program that is capable of turning off FB_EN.
• Change the memory/device setting of the CPU parameter so that the memory capacity required to use the FB is secured. If
the setting is not changed, an error may occur in GX Works2.
• Turning off FB_EN stops the processing that is being performed. Turning off FB_EN during the processing has a problem
where the connection can no longer be closed; turn off FB_EN after FB_OK (FB completed successfully) or FB_ERROR
(FB completed with an error) is turned on.
• During the execution of this FB, perform exclusive control to avoid using the same connection number.
• Use the FB in an environment where the scan time is 500ms or less.
• When this FB is changed online, o_bENO (Execution status), o_bOK (Completed successfully), o_bErr (Completed with an
error), and o_uErrId (Error code) are not retained. Turn i_bEN (Execution command) off and on after the online change.
• After the completion of the FB, wait for 8s or more before subsequent execution of the FB if it specifies a connection having
the same information (external device IP address, own station port number, and external device port number) as the
connection specified by the preceding FB. If the subsequent execution must be started within 8s, executing the FB after
changing the own station port number on the Active open side is recommended.
• Do not perform the open/close processing instruction (SP.SOCOPEN/SP.SOCCLOSE) in the socket communications
whose connection number is used in the FB. Doing so affects the FB operation.
Timing chart of I/O signals
■When the FB completed successfully
FB_EN
OFF
FB_ENO
OFF
Command send processing
Not performed
FB_OK
OFF
FB_ERROR
OFF
ERROR_ID
■When the FB completed with an error
FB_EN
OFF
FB_ENO
OFF
Command send processing
Not performed
FB_OK
OFF
FB_ERROR
OFF
ERROR_ID
ON
ON
Performed
ON
0
ON
ON
Not performed
Performed
ON
0 Error code
10 FB LIBRARY DETAILS (FOR MELSEC-Q SERIES CPU MODULES)
OFF
OFF
Not performed
OFF
OFF
OFF
OFF
0
10.1 M+CPU-CamRec_AXIS_SetTime
10
95