Table of Contents
Advertisement
General-Purpose Communication
Timing chart
Data in the table [S] specified by GPSEND instruction are sent, in ascending order from
lower bytes.
During the sending process, the "General-purpose communication Sending active flag" (Y8)
turns ON. The flag is turned OFF when sending is completed. (The flag does not turn off
right after the execution of the instruction. It turns off at the beginning of the second scan.)
The sending result (0: normal completion, 1: abnormal completion) is saved in the general-
purpose communication sending result flag (Y0).
General purpose
communication Clear to
send flag (X8)
General-purpose
communication Sending
active flag (Y8)
Execute GPSEND
Sending done result
flag (Y0)
Sending data
I/O allocation
COM port no.
X8
Y8
Y0
(Note 1) Each contact is used for reading the operation status. Do not write over it with a user program.
(Note 2) When the sending time is shorter than the scan time, the "General-purpose communication Sending active
flag" (Y8) turns OFF when the GPSEND instruction is executed in the subsequent scan following data
sending completion. In all cases, it is turned ON for at least one scan time.
KEY POINTS
Specify the port targeted for communication, using UNITSEL instruction
immediately before GPSEND instruction.
Maintain the ON conditions for GPSEND instruction until sending is
completed and the general-purpose communication sending active flag (Y8)
turns OFF.
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
Confirm ON
Confirm OFF
Name
General-purpose
communication Clear to
send flag
General-purpose
communication
Sending active flag
Sending done result
flag
Conditions to enable execution of
GPSEND instruction
Clear to send flag (X8): ON
Sending active flag (Y8): OFF
Sending active flag (Y8):
Sending data: ON, Sending done: OFF
Sending done result flag (Y0):
Normal completion: OFF
Abnormal completion: ON
Explanation
Turns ON when the unit is set to the general-purpose
communication mode.
Turns ON during sending data based on general-purpose
communication GPSEND.
Turns OFF when the sending process is completed.
Reports completion result of sending data in genera-purpose
communication or master communication.
(Normal completion: 0, Abnormal completion: 1)
Advertisement
Table of Contents
