7-10
Chapter 7. CPL COMMUNICATION FUNCTION
Fixed length continuous data write command (WD command)
This command writes continuous data in two-byte units. This command is suitable
for handling data in ladder programs sent by PLC communications as the data is of
a fixed length.
The start data address is expressed as four hexadecimal digits. Data is expressed as
four X n (n is a positive integer) hexadecimal digits.
Send message
The write start data address (four hexadecimal digits) and the number of write data
(four X n hexadecimal digits) are sent.
W
• Writing of single data item
D
• Writing of multiple data items
(1) Fixed length continuous data write command
(2) Start data address
(3) Data 1
(4) Data 2 to data (n-1)
(5) Data n
(1) (2) (3)
(5)
W
(1)
D
(2) (3) (4)
Response message
If writing is successful, the normal termination code (two decimal digits) is
returned. If only part of the data is written, and the remaining data is not written,
the warning termination code (two decimal digits) is returned. If none of the data
is written, the abnormal termination code (two decimal digits) is returned.
7 - 6 List of Termination Codes (p.7-15).
0
• Normal termination
(1)
0
• Abnormal termination or warning
X
(1)
X
The abnormal termination code is entered at XX.
For details of codes,
(1) Termination code
Maximum number of write data per message
RAM area: Up to 27 words
EEPROM area: Up to 16 words
To Next Page
Loading...
Need help?
General
