Yaskawa MP920 Communications Module - Manual (Page 186)

7 218IF Module
7.8.3 Programming
7-40
7.8.3 Programming
„ 218IFA Programming Suggestions
The 218IFA communicates with the MELSEC Controller that performs Extended MEMO-
BUS and MELSEC message conversion processing. Thus there is no need for the MELSEC
message configuration to be recognized by the user application. The user can easily commu-
nicate with the MELSEC Controller by using the MSG-SND function to specify MELSEC
under Protocol Type in the 218IFA Connection Parameter Window.
Refer to the list of MELSEC commands for the commands that are used by the MSG-SND
function, and the MEMOBUS commands corresponding to the MELSEC commands.
For example, MEMOBUS command 01 or 02 will correspond to MELSEC command 00
(reads bit devices in 1-bit units).
„ MELSEC Programs
The Ethernet Module (AJ71E71) must be initialized by the MELSEC ladder logic program.
Refer to the procedure for refreshing other nodes in the MELSEC manual, and create a lad-
der logic program for initial processing.
7.8.4 MELSEC Commands
The following table shows the common MELSEC ACPU commands that are supported by
the MP900-Series 218IFA Module, and the corresponding MEMOBUS command numbers.
Table 7.8 Common MELSEC ACPU Commands
Command Description Qty 218IFA
Support *
MEMOBUS
Command
00H Reads bit devices in 1-point units 256 points Yes 01H/02H
01H Reads bit devices in 16-point units 128 words
(2,048 points)
No −
Reads word devices in 1-point units 256 points Yes 03H/04H/
09H/0AH
02H Writes bit devices in 1-point units 256 points Yes 05H/0FH
03H Writes bit devices in 16-point units 40 words
(640 points)
No −
Writes word devices in 1-point units 256 points Yes 06H/0BH/10H
04H Randomly specifies, sets, and resets bit devices and device
numbers in 1-point units 80 points No −
05H Randomly specifies, sets, and resets bit devices and device
numbers in 16-point units 40 words
(640 points)
No −
Randomly specifies, sets, and resets word devices and device
numbers in 1-point units 40 points Yes 0EH
06H Sets the bit devices to be monitored in 1-point units 40 points No −