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MELSEC-Q
11 INSTRUCTIONS AND FUNCTIONS
Available only in execution mode
ZMESSAGE OPEN
Instruction
ZMESSAGE OPEN
• Opens a previously defined message port.
ZMESSAGE OPEN <message port number>
Syntax
<message port number>
• • • •
Specify the number of the message port to be
opened.
Examples
ZMESSAGE OPEN 1
• • • •
Opens the message port of message port number 1.
Description
• The ZMESSAGE OPEN instruction is used to open message ports previously defined by
the ZMESSAGE instruction.
• Specify the message port number of the message port to be opened in <message port
number>.
• The ZMESSAGE instruction only defines the message ports; the message ports may be
used by the ZMESSAGE OPEN instruction.
• An error occurs if the ZMESSAGE OPEN instruction is executed on message ports that have
not been defined by the ZMESSAGE instruction.
• Execute the ZMESSAGE OPEN instruction in each program executed in multitask operations.
REMARK
See the ZMESSAGE, ZMESSAGE CLOSE, ZMESSAGE GET, ZMESSAGE KILL
and ZMESSAGE PUT instructions, and Section 8.5.2.