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871
Network Instructions
Section 3-25
Communications Flags
The operation of the communications flags is outlined below.
• The Communications Port Enabled Flag is reset to 0 when communica-
tions are in progress and set to 1 when communications are completed
(normally or not).
• The status of the Communications Port Error Flag is maintained until the
next time that data is transmitted or received.
• The Communications Port Error Flag will be reset to 0 the next time that
data is transmitted or received, even if there was an error in the previous
operation.
About Communications
Port Numbers
There are 8 logical communications ports provided, so 8 communications
instructions can be executed simultaneously. Only one instruction can be exe-
cuted at a time for each communications port. Exclusive control must be used
when more than 8 instructions are executed.
These 8 communications port numbers are shared by the network instructions
(SEND(090), RECV(098), and CMND(490)) and the PROTOCOL MACRO
instruction (PMCR(260)). Be sure not to specify the same port number on two
instructions at the same time.
Communications Port
Enabled Flag
Instruction 1
executing
Instruction 2
executing
Instruction 3
executing
Network instruction
(SEND, RECV, or CMND)
Communications Port
Error Flag
Communications Port
Completion Code
Previous
completion
0000 (Normal
completion)
0204
0000 (Normal completion)
Busy
Controller Link Unit or
Ethernet Unit
Port
CPU Unit
Instruction 1
Instruction 2
Instruction 3
Instruction 4
Instruction 5
Instruction 6
Instruction 7
Instruction 8
Summary of Contents for CJ1G-CPUxx
Page 3: ...iv N o t i c e ...
Page 5: ...vi ...
Page 21: ...xxii Conformance to EC Directives 6 ...
Page 35: ......
Page 1131: ...1110 CJ series Instruction Execution Times and Number of Steps Section 4 2 ...