Read Id Command (Id_Rd: 03H) - YASKAWA S-7 Series Command Manual

3.1 Common Commands

3.1.2 Read ID Command (ID_RD: 03h)

3.1.2

Read ID Command (ID_RD: 03h)

Data Format
Phases in which the
Command can be Executed
Processing Time
Byte
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
3-4
2, 3
Within
communication
cycle
ID_RD
Command Response
03h 03h
WDT RWDT
CMD_CTRL CMD_STAT
ID_CODE ID_CODE
OFFSET OFFSET
SIZE SIZE
Reserved ID
Command Common
command
Classification
Subcommand
Description
• The ID_RD command reads the ID of a device. This
command reads the product information as ID data.
• The ID data is selected in detail by specifying ID_CODE.
• Confirm the completion of the command execution by
checking that RCMD = ID_RD (= 03h) and
CMD_STAT.CMDRDY = 1, and also checking the setting
for ID_CODE, OFFSET and SIZE.
In the following cases, an alarm will occur. Do not read ID
in the response in those cases because the ID value will
be indefinite.
• When the ID_CODE data is invalid:
CMD_ALM = 9h (A.94A)
• When the OFFSET data is invalid or the SIZE data do
not match: CMD_ALM = 9h (A.94D)
If the OFFSET or SIZE data is invalid for the specified
ID_CODE, an alarm occurs.
Example:Setting OFFSET = 3 and SIZE = 4 for reading the
device version (4-byte data) specifies reading of data out-
side the device version data (4 bytes) and generates an
alarm.
Asynchronous
command
Can be used