Composite Read From Variable Area - Omron E5AN Communications Manual

SECTION 2 CompoWay/F Communications Procedures

■ Composite Read from Variable Area

2-12
Note: For details on AT (auto-tuning), refer to the E5CN/E5AN/E5EN/
E5GN Digital Temperature Controllers User's Manual Basic Type
(Cat. No. H156).
(5) Precautions
● Alarm Function
Even though alarms are not displayed on the Controller's display, they
function normally in communications.
This service reads in order the contents of specified addresses in the
variable area.
Service Request PDU
Read
Variable
MRC SRC
address
type
0 1 0 4
2 2 2 4
Service Response PDU
Response Variable
MRC SRC
code type
0 1 0 4
2 2 4
Note: The read data is read together with the variable type in the order
specified by the command.
(1) Variable Type and Read Start Address
For details on variable types and read start addresses, see SECTION 3
Communications Data for CompoWay/F and SYSWAY.
(2) Bit Position
The E5CN/AN/EN/GN does not support bit access. Fixed to "00."
(3) Number of Read Data Items (Variable Type + Read Data + Bit
Position Counted As 1 Item)
Read data length
(variable type C0, C1, or C3)
For double word
(variable type 80, 81, or 83)
For word
Bit
Read
Variable
position
address
type
0 0
2 2
Read data
Number of elements ×8 or 4
2
Variable
type
Number of elements ×8 or 4
2
Number of read data items
20 max.
25 max.
Bit
position
0 0
4 2
Read data