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17 COMMUNICATING USING 1C FRAMES
17.6 Read and write Buffer Memory of Special Function Module
Batch write (command: TW)
Write data to the buffer memory of a special function module.
Message format
The following shows the message format of the request data and response data of the command.
■Request data
■Response data
There is no response data for this command.
Data specified by request data
■Command
■Message wait
Specify the delayed time of the response transmission. (Page 347 Message wait)
■Start address
Specify the start address of the buffer memory to be written in five digits. (Page 386 Start address)
■Byte length
Convert the numerical value to 2-digit ASCII code (hexadecimal), and send it from the upper digits.
Specify the byte length within the following ranges:
•1 Byte length 128
■Special function module No.
Specify in two characters. (Page 386 Special function module No.)
■Write data
Store the data written to buffer memory.
The content of one data may cross 2 or 3 bytes depending on the special function module. For the
specifications of byte length, refer to the manual of each module.
Communication example
Write data of 4 bytes under the following conditions.
• Message wait: 0 ms
• Start address: 27FAH
• Byte length: 4 bytes
• Special function module No.: 13 (input/output signals are 120H to 13FH)
(Request data)
ACPU common
TW
54
H
57
H
Message wait Start address Write data
Byte length
Special function
module No.
CD01H
EFABH
(27FCH)
(27FAH)
27FAH 27FCH
TW
54
H
57
H
30
H
F
37
H
46
H
41
H
04
30
H
34
H
A2
32
H
30
H
00 7
31
H
3
33
H
1
30
H
D
43
H
44
H
1
31
H
0C
41
H
F
45
H
46
H
B
42
H
AE
Special function module No.
Message wait
Start address Write data
Byte length
Buffer memory
Start address
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