Mechatrolink-Ii Commands; Main Commands; Nop: 00 (Hex.) (No Operation); Prm_Rd: 01 (Hex.) (Read Parameter) - YASKAWA MECHATROLINK-II SI-T3 Technical Manual

8

MECHATROLINK-II Commands

◆

Main Commands

■

NOP: 00 (Hex.) (No Operation)

Byte
1
2
3, 4
5 - 15
16
Only the ALARM and STATUS fields of the response data can be monitored. This command can be used in all
phases.
■

PRM_RD: 01 (Hex.) (Read Parameter)

Byte
1
2
3, 4
5, 6
7
8 - 15
16
The PRM_RD command is used to read the Drive internal parameters. For offline parameters, it reads the most
recently updated setting values. This command can be used in all phases.
In the following cases, a warning (STATUS (WARNG) = 1) is generated and the command is ignored. If a
warning is generated, the values that are read are undefined.
• If a register number (NO) fault occurs: Data setting warning (A.94)
• If SIZE is an odd number or is not between 2 and 8: Data setting warning (A.94)
The register number (NO) is the same as the register number that is set and referenced in MEMOBUS/Modbus
transfers. Set the lower byte (LSB) before you set the upper byte (MSB). The SI-T3 stores the data read for
PARAMETER from lower byte (LSB) to upper byte (MSB). Refer to the drive technical manual for more
information.
For SIZE, set the number of bytes to be read as an even numbers. You can specify eight bytes.
The values for the number (NO) and the size (SIZE) in the response data are copies of the values in the command
data.
Example when reading C1-01 (200 (Hex.))
Byte
5
6
7
8
9
YASKAWA SIEP C730600 86F MECHATROLINK-II Technical Manual
Command
NOP
0
WDT
Command
PRM_RD
0
NO
SIZE
0
WDT
Table 8.1 Example when reading C1-01 (200 (Hex.))
Command (Hex.)
00
02
02
00
00
8 MECHATROLINK-II Commands
Response
NOP
ALARM
STATUS
0
RWDT
Response
PRM_RD
ALARM
STATUS
NO
SIZE
PARAMETER
RWDT
Response (Hex.)
00
02
02
Lower byte of C1-01
Upper byte of C1-01
25