Read Memory Command (Mem_Rd: 1Dh) - YASKAWA S-7 Series Command Manual

3.1 Common Commands

3.1.9 Read Memory Command (MEM_RD: 1Dh)

3.1.9

Read Memory Command (MEM_RD: 1Dh)

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
Command Parameters
The details of MODE/DATA_TYPE are described below.
bit7
MODE = 1: Volatile memory, 2: Not supported
DATA_TYPE = 1: Byte, 2: Short, 3: Long, 4: Not supported
SIZE:
ADDRESS: Initial address for reading
DATA:
3-20
2, 3
Within 200 ms
MEM_RD
Command Response
1Dh 1Dh
WDT RWDT
CMD_CTRL CMD_STAT
Reserved Reserved
MODE/DATA_- MODE/DATA_-
TYPE TYPE
SIZE SIZE
ADDRESS ADDRESS
Reserved DATA
bit6 bit5
MODE
Data size for reading (of type specified by DATA_TYPE)
Read data
Command
Classification
Subcommand
• The MEM_RD command reads the data stored in virtual
memory by specifying the initial address and the data
size for reading.
• Confirm the completion of the command execution by
checking that RCMD = MEM_RD (= 1Dh) and
CMD_STAT.CMDRDY = 1, and also checking the setting
for ADDRESS, SIZE and MODE/DATA_TYPE.
In the following cases, an alarm will occur. Do not read
DATA in the response in these cases because the DATA
value will be indefinite.
• When the ADDRESS data is invalid:
CMD_ALM = 9h (A.94A)
• When the MODE/DATA_TYPE data is invalid:
CMD_ALM = 9h (A.94B)
• When the SIZE data is invalid: CMD_ALM = 9h (A.94D)
• While editing using SigmaWin or digital operator:
CMD_ALM = Ah (A.95A)
Refer to the following section for details.

Method to Access Virtual Memory Areas on page 3-23.
bit4 bit3 bit2
Common Asynchronous
command command
Cannot be used
Description
bit1 bit0
DATA_TYPE