Composite Read From Variable Area - Omron EJ1 User Manual

Detailed Description of Services
6-4-3

Composite Read from Variable Area

150
This service reads in order the contents of specified addresses in a variable
area.
Command
Service Request PDU
Read address Bit
Variable
MRC SRC
type
0 1 0 4
2 2 2
Response
Service Response PDU
MRC SRC Response
code
0 1 0 4
2 2 4
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 193.
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
Response code Error name
1002 Command too short
1101 Area type error
110B Response too long
1100 Parameter error
7011 Operation error (7011) The command cannot be executed due to
0000 Normal completion
4. No. of Read Data Items (Variable Type + Read Data)
Read data length
For double-word (8-digit) variable type
For word (4-digit) variable type
Variable
position
type
0 0
4 2
Variable
Read data
type
No. of elements × 8 or 4
2
Variable
type
2
The command is not long enough.
The corresponding variable type does not
exist.
The number of elements exceeds the
maximum.
Bit position is not 00.
a device error.
Processing was completed normally.
32 max. (0020H)
41 max. (0029H)
Section 6-4
Read address Bit
position
0 0
2 4 2
Read data
No. of elements × 8 or 4
Cause
No. of read data items