YASKAWA MP920 User Manual page 41

MELSEC Commands Supported by the 218IF
The following table shows the common MELSEC ACPU commands supported by the
MP900-Series 218IF Module, and the MEMOBUS command codes corresponding to these
commands.
Extended MELSEC
MEMOBUS Command
Command
01H/02H 00H
−
01H
03H/04H
09H/0AH
05H/0FH 02H
−
03H
06H/00BH
10H
−
05H
0EH
08H 16H
31H 60H
32H 61H
33H 62H
Note: Special AnACPU commands are not supported. Use the common
ACPU commands for AnACPU access. AnACPU expansion registers
cannot be accessed.
Communications Programs
MELSEC protocol communications can be performed by user programs using the MSG-
SND and MSG-RCV functions.
Refer to Appendix A System Functions for information on using the MSG-SND and MSG-
RCV functions.
The MELSEC protocol functions supported by the 217IF and the 218IF differ.
INFO
Table 3.4 Common MELSEC ACPU Commands
Description
Reads bit devices in 1-point units
Reads bit devices in 16-point units
Reads word devices in 1-point units
Writes bit devices in 1-point units
Writes bit devices in 16-point units
Writes word devices in 1-point units
Randomly specifies, sets, and resets
bit devices and device numbers in
16-point units
Randomly specifies, sets, and resets
word devices and device numbers in
1-point units
Loopback test
Fixed buffer communications
Reads random access buffer commu-
nications
Writes random access buffer com-
munications
3-9
3.2 Protocol Functions
Qty Remarks
256 points
Not supported
128 words
(2,048 points)
256 points
256 points
Not supported
40 words (640 points)
256 points
Not supported
40 words (640 points)
40 points
256 bytes
507 words
508 words
508 words
−
−
−
3
−
−
−
−
−
−