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FS-8700-24 ControlNet Driver Manual Page 9 of 12
FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web:www.fieldServer.com
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4.3.2. Driver Specific Map Descriptor Parameters
Column Title Function Legal Values
Node_Name
Name of Node to
communicate with
One of the node names
specified in “Node Descriptor”
above
Block_Number PLC File Number
For local node 7-39
For remote node 1-999
PCCC_Type
Type of PCCC data to be
transferred over
ControlNet
UINT, (SINT, INT) (REAL,
FLOAT) (BOOL, BIT, FLAG)
Equal types are shown in
brackets.
Address Starting address within file
0 – 999 ( INT, SINT )
0 – 499 ( REAL, FLOAT )
0 – 15999 ( BOOL, BIT, FLAG )
Length Length of Map Descriptor
1 – 249 ( INT, SINT )
1 – 124 ( REAL, FLOAT )
1 – 3984 ( BOOL, BIT, FLAG )
Note the number of bytes per PCCC_Type:
SINT, INT = 2 bytes, REAL, FLOAT = 4 bytes, BOOL, BIT, FLAG = 8 bits per byte
Each PLC file is 2000 bytes long and therefore the address values will range from zero
to a maximum value as indicated. The start address is specified in increments of the
basic data type specified under PCCC_Type.
The message buffers in the ControlNet card are each 498 bytes long and only one
message buffer can be allocated to a Map Descriptor. The Map Descriptor lengths are
therefore limited to maximum values as indicated when taking the data type byte lengths
into account.
4.3.3. Timing Parameters
Column Title Function Legal Values
Scan_Interval Rate at which data is polled >0.1s