217If Communications Protocols; Memobus Communications - YASKAWA MP920 User Manual

6.6

217IF Communications Protocols

The 217IF Module supports Yaskawa's standard MEMOBUS communications protocol, as well
as various other communications protocols.
As standard functions, the MELSEC communications protocol is provided for connection with
controllers manufactured by Mitsubishi Electric Corporation, and the OMRON communications
protocol is provided for connection with Programmable Controllers manufactured by OMRON
Corporation.
6.6.1

MEMOBUS Communications

MEMOBUS communications are message transmissions using the MEMOBUS protocol.
The following table shows the correspondences between the MEMOBUS commands and
registers.
Coil
Input Relays
Input Registers
Holding Registers 400001 to
Table 6.7 Correspondences between MEMOBUS Reference and Register Numbers
Type MEMOBUS
Reference No.
000001 to
0
100001 to
1
300001 to
3
4
* 1. MEMOBUS Reference No.
This is the leading number used by a standard Yaskawa MEMOBUS
protocol message. The leading number in the above range is allocated
to coils, input relays, input registers, and holding registers. The first
digit is the register type, and the remaining digits is the leading num-
ber beginning from 1.
* 2. MEMOBUS Command
This is the command number set in the MEMOBUS protocol.
* 3. Leading No.
This is the leading number used by the MP900. All numbers start from
0 (zero).
* 4. Register No.
This is the number of each register corresponding to the leading num-
ber. Register number offsets can be specified for coils, input relays,
input registers, and holding registers by the MSG-SND and MSG-
RCV system functions.
For example, with Yaskawa MP-series:
6-21

6.6 217IF Communications Protocols

MEMOBUS
*1 *2
Command
Leading No.
01H, 05H, 0FH 000000 and
higher
02H 00000 and higher IB00000 and
04H 00000 and higher IW0000 and
03H, 10H 00000 and higher MW00000 and
MP9
*3 *4
Register No.
MB000000 and
higher
higher
6
higher
higher