Yaskawa MP940 - Manual (Page 104)

4.2 Serial Communications Function
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4.2.6 Serial Communications Protocol
The MP940 Module can handle various communications protocols, including the standard
Yaskawa MEMOBUS communications protocol.
It also provides the MELSEC communications protocol as a standard function for connect-
ing to Mitsubishi Electric controllers.
„ MEMOBUS Communications
MEMOBUS communications are message transmissions following the MEMOBUS proto-
col.
Table 4.2 Correspondence Between MEMOBUS Reference and Register Numbers
∗ 1. MEMOBUS reference numbers are leading numbers used by Yaskawa
MEMOBUS protocol messages. They are allocated in the ranges
shown in the table to coils, input relays, input registers, and holding
registers. The first digit represents the classification, and the follow-
ing digits are the start number beginning from 1.
∗ 2. MEMOBUS commands are command codes set in the MEMOBUS
protocol.
∗ 3. Leading numbers are initial addressed used by the MP940, and they all
begin from 0 (zero).
∗ 4. Register numbers are numbers for each register that correspond to the
leading numbers. These register numbers can be designated for offset
by the system functions MSG-SND and MSG-RCV, along with coils,
input relays, input registers, and holding registers.
For example, with Yaskawa GL:
Classification
MEMOBUS
Reference Numbers
*1
MEMOBUS
Commands *2
MP940
Leading
Number *3
Register
Number *4
Coils 000001 - 0XXXXX 01H, 05H, 0FH 000000- MB000000-
Input relays 100001 - 1XXXXX 02H 00000- IB00000-
Input registers 300001 - 3XXXXX 04H 00000- IW0000-
Holding
registers 400001 - 4XXXXX 05H 00000- MW00000-