Omron SYSMAC CJ - REFERENCE MANUAL 08-2008

1072
Network Instructions Section 3-25
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+3
• Storing Data from the Rightmost Byte (Bits 12 to 15 of C = 8 hex)
Example: Storing the value 1234 hex in D+3
2. Data in 4-byte Units
• Storing Data from the Leftmost Byte (Bits 12 to 15 of C = 0 hex)
Example: Storing the value 12345678 hex in D+3 and D+4
• Storing Data from the Rightmost Byte (Bits 12 to 15 of C = 8 hex)
Example: Storing the value 12345678 hex in D+3 and D+4
Note The examples above only show the storage of received data in D+3, but send
data is stored in S+6 in the same way.
Example In this example, EXPLT(720) is used to read the total ON time or number of
contact operations from a DRT2 Slave (I/O Terminal).
34
15
341D+3 2
08 07
00
12
Frame
The data in the frame is in the order 34 → 12.
In this case, 1234 hex is
stored from the leftmost
byte in the order 34 → 12.
34
15
D+3
08 07
00
12
1234
Frame
The data in the frame is in the order 34 → 12.
In this case, 1234 hex is
stored from the
rightmost byte in the
order 34 → 12.
78
15
785D+3
D+4
6
3412
08 07
00
56 34 12
Frame
The data in the frame is in the order 78 → 56 → 34 → 12.
In this case, 12345678 hex is
stored from the leftmost byte in
the order 78 → 56 → 34 → 12.
78
15
D+3
D+4
1234
08 07
00
56 34 12
5678
Frame
The data in the frame is in the order 78 → 56 → 34 → 12.
In this case, 12345678 hex is
stored from the rightmost byte in
the order 78 → 56 → 34 → 12.
000000
A20206
S
D
C
EXPLT
D00000
D00100
D00200
Communications Port
Enabled Flag (Port 6)