Omron SYSMAC CJ - REFERENCE MANUAL 01-2008 Reference Manual page 1118

Network Instructions
Precautions
Name Address
Communications A21900 to
Port Error Flag A21907
Communications A203 to
Port Completion A210
Codes
Be sure that the order of bytes in the source data matches the order in the
explicit message's frame (order of data in the line). For example, when the
service data is in 2-byte or 4-byte units, the order of data in the frame is left-
most to rightmost order in 2-digit pairs, as shown in the following diagram.
Command format
Example: Address 1234 hex
stored in 34 12 order
Service Data:1234Hex
The following diagrams show how data is stored in the data areas when the
service data is in 2-byte or 4-byte units.
1. Data in 2-byte Units
• Storing Data from the Leftmost Byte (Bits 12 to 15 of C = 0 hex)
Example: Storing the value 1234 hex in D+1
Frame
These flags are turned ON to indicate that the
explicit message itself was not sent from the cor-
responding ports (00 to 07) during execution of
an explicit message 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.
These words contain the completion codes for the
corresponding ports (00 to 07) following execu-
tion of a network instruction.
The corresponding word will contain 0000
while the Explicit Communications Error Flag
is OFF.
The corresponding word will contain a FINS
error code when that port's Explicit Communi-
cations Error Flag and Communications Port
Error Flag are both ON.
The corresponding word will contain the
appropriate explicit message error code when
that port's Explicit Communications Error Flag
is ON and the Communications Port Error
Flag is OFF.
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.
Example: Cumulative time12345678
hex stored in 78 56
34 12 78
Service Data:12345678Hex
The data in the frame is
in the order 34 12.
34 12
In this case, 1234 hex is
stored from the leftmost
byte in the order 34 12.
15 08 07
D+1 3 4 1
Section 3-25
Operation
34 12 order
56 34 12
00
2
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