Melsec commands – Yaskawa MP940 User Manual
Page 107
MP940 Functions
4.2.6 Serial Communications Protocol
4-14
MELSEC Commands
The following table shows the MELSEC ACPU commands that are supported by the
SERIAL Module, and the corresponding MEMOBUS command codes.
Table 4.4 MELSEC ACPU Commands
Command
Description
Qty
SERIAL
Support*
MEMOBUS
Command
BR
Reads bit devices in 1-point units
256 points
No
---
WR
Reads bit devices in 16-point units
32 words
(512 points)
Yes
01H/02H
Reads word devices in 1-point units
64 points
Yes
03H/04H
BW
Writes bit devices in 1-point units
160 points
No
---
WW
Writes bit devices in 16-point units
10 words
(160 points)
Yes
0FH
Writes word devices in 1-point units
64 points
Yes
10H
BT
Randomly specifies, sets, and resets bit devices and device
numbers in 1-point units
20 points
No
---
WT
Randomly specifies, sets, and resets bit devices and device
numbers in 16-point units
10 words
(160 points)
No
---
Randomly specifies, sets, and resets word devices and
device numbers in 1-point units
10 points
No
---
BM
Sets the bit devices to be monitored in 1-point units
40 points
No
---
WM
Sets the bit devices to be monitored in 16-point units
20 words
(320 points)
No
---
Sets the word devices to be monitored in 1-point units
20 points
No
---
MB
Monitors devices for which monitor data registration has
been performed (in bit units)
---
No
---
MN
Monitors devices for which monitor data registration has
been performed (in word units)
---
No
---
ER
Reads extension file registers in 1-point units
64 points
No
---
EW
Writes extension file registers in 1-point units
64 points
No
---
ET
Randomly specifies block numbers and device numbers,
and writes to the extension file registers in 1-point units
10 points
No
---
EM
Registers the extension file registers to be monitored in 1-
point units
20 points
No
---
ME
Monitors extension file registers for which monitor data
registration has been performed
---
No
---
CR
Reads the data in the buffer memory
64 words
No
---
CW
Writes the data in the buffer memory
64 words
No
---
TR
Reads the contents of the buffer memory of the special func-
tion unit
64 words
No
---
TW
Writes data to the buffer memory of the special function unit 64 words
No
---
MR
Reads the main sequence program
64 steps
No
---
SR
Reads the sub-sequence program
64 steps
No
---
MW
Writes the main sequence program
64 steps
No
---
SW
Writes the sub-sequence program
64 steps
No
---