FieldServer Omron FINS FS-8704-16, Driver Manual

Page: 14 / 40

FS-8704-16 Omron FINS Manual Page 11 of 37
FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web :www.fieldserver.com
Tel : (408) 262-2299 Fax : (408) 262-9042 Toll_Free : 888-509-1970 email : support@fieldserver.com
4.1.4. 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