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FS -8704-13 GE-SRTP Driver Manual
FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 (408) 262-2299 fax: (408) 262-9042
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Page 7
4.4.4 Map Descriptor Example 1 – Simple Read.
This example provides a map descriptor to read 10 bytes of Discrete Input states, starting at the very first Discrete Input. The data is stored in a data array
called DA_DI and the first input is stored at location 100 in the array (101
st
element). The PLC is polled every 2 seconds
Map_Descriptor_Name, Data_Array_Name, Data_Array_Offset, Function, Scan_Interval, node_name, Address, Length, Data_Type
CMD_AI_01 , DA_AI_01 , 0 , rdbc , 1.0s , Node_A , 1 , 10 , %AI
Data Type. Use the
% symbol as you
would if you were
programming a GE
PLC.
The name of the
data array in
which the driver
will store the data.
The name must
correspond to a
data array defined
in the data array
section of the
CSV file.
Read will be
performed
every 2.0
Seconds.
RDBC =
Read Block
Continuous.
The driver
will re
ad data
from the PLC
continuously.
Map descriptor
names may be
used in driver
error messages. It
is not essential,
but it is useful to
use unique names.
Location in the data
array at which the first
element of data will be
stored. The arrays are
zero referenced so an
offset of 100 indicates
the 101st element of
the array.
The node must have
been defined
previously in the
Nodes section of the
CSV file.
The node name
connects this map
descriptor to a node
which in turn
connects the map
descriptor to a port.
The address and length
specify the first
element and the
number of elements
that must be read from
the PLC’s data tables.
GE PLC’s reference
data tables starting at
element 1.
Unless otherwise
specified the driver
reads bytes and words.
This map descriptor
reads 10 bytes of data
– covering %I1 to
%I79.