FieldServer FS-8700-66 - Manual (Page 12)

FS-8700-66 GE-SNP Driver Manual Page 12 of 28
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5.3.4 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 , Node_Name , Address , Length , Scan_Interval , Data_Type
Read D1
, DA_D1 , 100 , Rdbc , PLC-1 , 1 , 10 , 2.0 , %1
5.3.5 Map Descriptor Example 2 – Simple Write
This example writes data from the FieldServer Data Array called DA_AO to the PLC identified as NODE1. The write is repeated every 5 seconds. Ten word values are
written to the PLC’s %AQ Data Table starting at location 20.
Map_Descriptor_Name , Data_Array_Name , Data_Array_Offset , Function , Node_Name , Address , Length , Scan_Interval , Data_Type
Write_AO
, DA_AO , 0 , Wrbc , Node1 , 20 , 10 , 5.0 , %AQ
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 Section 4
Map Descriptor names
may be used in driver error
messages. It is useful to
use unique names.
RDBC = read block
continuous. The driver will
read data from the PLC
continuously.
The Node as defined
in Section 5.2. The
Node Name
connects the 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 bytes of
data covering %I1 to %I79
Read will be
performed every
2.0s.
Write to PLC Table element number 20 to 29
inclusive (10 elements)
Write continuously Write to the %AQ
(Analog Output) table
in the PLC.
Location in the Data Array
where the first element of
data will be stored. An
offset of 100 indicates the
101
st
element of the array.