FieldServer Omron FINS FS-8704-16 - Manual (Page 13)

FS-8704-16 Omron FINS Manual Page 13 of 38
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4.5.4 Map Descriptor Example 1 – IO Read
This example provides all the required information to read and write to the IO memory area of the PLC. The following Map Descriptor creates a task for the
driver to read the first 20 Words from the CIO memory area and store them in the Data Array DA_CIO. The first word from the PLC will be stored as the first
element in the Data Array. Whenever an upstream device writes any element in the Data Array, the Driver will write the same value to the PLC at the
corresponding address. This scheme is known as Write-thru. In this example the Driver can write only one value at a time.
Map_Descriptor_Name ,Data_Array_Name ,Data_Array_Offset ,Function ,Node_Name ,Address ,Length ,Data_Type ,Command_Name ,Unit_number
CMD_CIO ,DA_CIO ,0 ,RDBC ,PLC1 ,0 ,20
,CIO-
WORD ,MEMORY AREA
READ
,0
Command Name specifies the Main and
Sub request codes to make a request to
read this memory from PLC.
Assigning Direct MRC and SRC parameters
can replace this parameter.
See chapter 6 to know valid MRC –SRC
values to read this CIO memory area.
This is the logical name
of the target device
having the parameters
defined in section
“Client Node
Descriptors”.
One of the Data Arrays
declared in the
Data_Array section
The Data for CIO
memory area from the
Node (PLC1) will be
stored in this Data
Array.
Offset within the Data Array
at which Driver will the store
the data for initial Address
defined under “Address”
parameter.
In particular this case data for
Address 0 will be stored at
offset 0, for Address 1 offset
1 and so on.
Forcing the Driver to
issue a read request for
each Scan_Interval .
In particular case Driver
will read this portion of
CIO memory area for
each second if
Scan_Interval is set 1s.
Starting
Address of the
memory area
to read.
Specify the number of
elements (number of Words
in this case) to read from
PLC.
Specifies the type of target
memory at PLC.
Also this parameter can be
replaced with Memory_Code
parameter.
See chapter 6 to for memory
codes read CIO Word area.
Unit number at PLC