Batch Write Of Word Device (Ww Command) - Mitsubishi Electric MELSEC FX Series User Manual

FX communication
8.4

Batch Write of Word Device (WW command)

1 ) Command specification
Protocol format 1 is shown
Computer
Programmable
controller
Notes
• Specify the range and number of devices (16 bit words) so as to satisfy the following
conditions.
- 1
- Head device No. + number of devices (number of devices
device) -1
• The station number, PC (PLC) number, number of devices, and sum check code are
expressed in hexadecimal.
2 ) Specification examples
a ) Example 1
To write to 32 points from M640 to M671 at station No.0 (with message wait time set to
0 ms).
Computer
Programmable
controller
0 0 1
M
6
5
5
Notes
• Command WW uses word units. When writing 32 points, the number of devices is
specified by "02" (16 points (bits) per one word unit).
Batch write Command (words)
Specifies the range of devices to be read.
One word device requires four hexadecimal digits.
Therefore,one word is expressed using four
characters.
≤
number of devices
≤
max. device No.
E
N 0 0 F F W W 0
Q
30H 30H 46H 46H 57H 57H 30H
05H
The sum check is calculated
over this range
1 2
0 0 0 1 1 0 1
M M
6 6
5 5
4 3
Character area C
Head device Number of
devices
(5 characters) (2 characters,
hexadecimal)
≤
64 (10 words in the case of bit devices)
M 0 6 4 0 0 2 2 3 4 7
32H 33H
4DH 30H 36H 34H 30H 30H 32H
3 7 A
0 0 0 1 1 1 1 0 1
M M M M M M M
6 6 6 6 6 6 6
4 4 4 4 7 7 6
3 2 1 0 1 0 9
Data of
the
specified
devices
×
16 in the case of bit
A B 9 6 0 5
34H 37H 41H 42H 39H 36H 30H 35H
A
C
K
06H
B 9
0 1 0 1 1 1 0 0 1
Commands 8
0 5 F F
30H 30H 46H 46H
6
0 1 1 0
M M M M
6 6 6 6
5 5 5 5
9 8 7 6
8-6