176
Detailed Description of Services
Section 6-4
6-4-3
Composite Read from Variable Area
This service reads in order the contents of specified addresses in a variable
area.
■
Command
Service Request PDU
■
Response
Service Response PDU
The read data is read together with the variable type, in the order specified in
the command.
1.
Variable Type and Read Address
Refer to
Parameter List
on page 233.
Composite reads cannot be performed for the DA/9A variable types.
2.
Bit Position
The EJ1 does not support bit access. Fixed to 00.
3.
Response Codes
4.
No. of Read Data Items (Variable Type + Read Data)
MRC
2
2
0
1
4
SRC
2
0
4
2
0
0
2
4
2
0
0
Variable
type
Read address Bit
position
Variable
type
Read address Bit
position
Response code
Error name
Cause
1002
Command too short
The command is not long enough.
1101
Area type error
The corresponding variable type does not
exist.
110B
Response too long
The number of elements exceeds the
maximum.
1100
Parameter error
Bit position is not 00.
7011
Operation error (7011) The command cannot be executed due to
a device error.
0000
Normal completion
Processing was completed normally.
Read data length
No. of read data items
For double-word (8-digit) variable type
32 max. (0020H)
For word (4-digit) variable type
41 max. (0029H)
MRC
2
0
1
4
SRC
2
0
4
2
2
Response
code
Variable
type
Read data
Read data
Variable
type
No. of elements
×
8 or 4
No. of elements
×
8 or 4
Summary of Contents for EJ1 EtherCAT
Page 2: ...EJ1 Modular Temperature Controllers User s Manual Revised July 2008 ...
Page 3: ...iv ...
Page 19: ...xx ...
Page 213: ...188 Detailed Description of Services Section 6 4 ...
Page 227: ...202 Detailed Description of Services Section 7 5 ...
Page 303: ...278 Index ...
Page 305: ......