Yaskawa MP920 Communications Module - Manual (Page 41)

3.2 Protocol Functions
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„ 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.
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.
Table 3.4 Common MELSEC ACPU Commands
Extended
MEMOBUS
Command
MELSEC
Command
Description Qty Remarks
01H/02H 00H Reads bit devices in 1-point units 256 points −
− 01H Reads bit devices in 16-point units 128 words
(2,048 points) Not supported
03H/04H
09H/0AH Reads word devices in 1-point units 256 points −
05H/0FH 02H Writes bit devices in 1-point units 256 points −
− 03H Writes bit devices in 16-point units 40 words (640 points) Not supported
06H/00BH
10H Writes word devices in 1-point units 256 points −
− 05H Randomly specifies, sets, and resets
bit devices and device numbers in
16-point units 40 words (640 points) Not supported
0EH Randomly specifies, sets, and resets
word devices and device numbers in
1-point units 40 points −
08H 16H Loopback test 256 bytes −
31H 60H Fixed buffer communications 507 words −
32H 61H Reads random access buffer commu-
nications 508 words −
33H 62H Writes random access buffer com-
munications 508 words −
INFO