Specifications

App - 66
Functions
(1) This instruction sends the data designated by (S3) to the external device of the
connection specified by (S1) for the module designated by Un.
(S3) No.1
No.n
No.16
BUFSND
PLC CPU
Ethernet module
Send data length
Send data
Send data
Fixed buffer
External device
(2) Whether or not the BUFSND instruction has been completed can be checked by the
complete bit devices (D1) + 0 and (D1) + 1.
(a) Complete bit device (D1) + 0
Turns on at the END processing of the scan where the CLOSE instruction is
completed, and turns off at the next END processing.
(b) Complete bit device (D1) + 1
Turns on and off depending on the complete status of the BUFSND instruction.
• Normal completion : Stays off and does not change.
• Abnormal completion : Turns on at the END processing of the scan where
the BUFSND instruction is completed, and turns off
at the next END processing.
[Operation when the BUFSND instruction is being executed]
Sequence program
Complete device
Complete device +1
END
processing
END
processing
END
processing
Scan Scan Scan
Instruction execution
Abnormal completion
BUFSND instruction
Send data
(3) The ZP.BUFSND instruction is executed when the send instruction switches from
off to on.
Errors
(1) When a dedicated instruction ends with an error, the abnormal completion signal,
(D1) + 1, turns on and the error code is stored in the complete status area (S2) + 1.
Refer to the following manuals regarding the error codes, check the errors and take
corrective actions.
<Error codes>
4FFF
H or less : QCPU (Q Mode) User's Manual (Hardware Design,
Maintenance and Inspection)
C000
H or higher : Q Corresponding Ethernet Interface Module User's Manual
(Basic)