Yaskawa Ladder Works Programming Manual - Manual (Page 193)

9.7 Send Message Function (MSG-SND)
9-18
REQUEST
1 = Request
0 = Completion of receipt report
■ Called Station # (PARAM02)
Serial
1～254 : Message is sent to the station of designated device address.
■ Function Code (PARAM04)
The MEMOBUS function code to be sent is set. Refer to Table 9.9.
Table 9.9 Function Codes
Function Code Setting
00H Unused ×
01H Read coil status ○
02H Read input relay status ○
03H Read contents of holding register ○
04H Read contents of input register ○
05H Change status of single coil ○
06H Write into a single holding register ○
07H Unused ×
08H Loop-back test ○
09H Read contents of holding register (expanded) ○
0AH Read contents of input register (expanded) ○
0BH Write into holding register (expanded) ○
0CH Unused ×
0DH Discontinuous readout of holding register (expanded) ○
0EH Discontinuous write into holding register (expanded) ○
0FH Change status of a multiple coil ○
10H Write into a plurality of holding register ○
11H to 20H Unused ×
21H to 3FH System reserved ×
40H to 4FH System reserved ×
50H to Unused ×
(× : cannot be set, ○ :can be set)
Note : Only MW (MB) can be used as the sending/receiving register during master operation. The
MB, MW, IB, and IW registers can be used respectively as the coil, holding register, input
relay, and input registers during slave operation.