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1057
Network Instructions
Section 3-25
Precautions
If the Communications Port Enabled Flag is OFF for the port number specified
in C+3, the instruction will be treated as NOP(000) and will not be executed.
The Error Flag will be turned ON in this case.
When an address in the current bank of the EM Area is specified for D, the
transmitted data will be written to the current EM bank of the destination node.
When data will be transmitted outside of the local network, the user must reg-
ister routing tables in the PLCs (CPU Units) in each network. (Routing tables
indicate the routes to other networks in which destination nodes are con-
nected.)
Refer to the FINS command response codes in the
CS/CJ Series Communi-
cations Commands Reference Manual
(W342) for details on the completion
codes for network communications.
Only one network instruction may be executed for a communications port at
one time. To ensure that RECV(098) is not executed while a port is busy, pro-
gram the port’s Communications Port Enabled Flag (A20200 to A20207) as a
normally open condition.
Communications port numbers 00 to 07 are shared by the network instruc-
tions and PMCR(260), so RECV(098) cannot be executed simultaneously
with PMCR(260) if the instructions are using the same port number.
Noise and other factors can cause the transmission or response to be cor-
rupted or lost, so we recommend setting the number of retries to a non-zero
value which will cause RECV(098) to be executed again if the response is not
received within the response monitoring time.
3-25-5 DELIVER COMMAND: CMND(490)
Purpose
Sends an FINS command and receives the response. Refer to the
CS/CJ
Series Communications Commands Reference Manual
for details on FINS
commands.
Ladder Symbol
Communications
Port Error Flag
A21900 to
A21907
These flags are turned ON to indicate that an
error has occurred at the corresponding ports (00
to 07) during execution of a network instruction.
The flag status is retained until the next network
instruction is executed. The flag will be turned
OFF when the next instruction is executed even if
an error occurred previously.
Communications
Port Completion
Codes
A203 to
A210
These words contain the completion codes for
the corresponding ports (00 to 07) following exe-
cution of a network instruction.
The corresponding word will contain 0000 while
the network instruction is being executed and the
completion code will be written when the instruc-
tion is completed. These words are cleared when
program execution begins.
Name
Address
Operation
CMND(490)
S
D
C
S
: First command word
D
: First response word
C
: First control word
Summary of Contents for SYSMAC CS1D-CPU**
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Page 185: ...146 List of Instructions by Function Code Section 2 4...
Page 1389: ...1350 CJ series Instruction Execution Times and Number of Steps Section 4 2...
Page 1390: ...1351 Appendix A ASCII Code Table ASCII SP Four leftmost bits Four rightmost bits...
Page 1391: ...1352 ASCII Code Table Appendix A...