221
ICC
Figure 63: Gateway Module Properties
In the “Connection Parameters” portion of the dialog box, enter the following
information:
Input:
The Input Assembly is the collection of monitor data that is produced
by the gateway and is received as an input to the PLC. The starting address
for produced data is specified by the Produced Data Start Address (refer to
section 8.7.6.1). The Input Assembly Instance must be set to 150 when
connecting to the vendor-specific I/O assembly instances, and the size must
be set to the number of elements (each of “Comm Format” type) that we
wish to receive from the gateway. Notice that the “number of bits” specified
to the right of the “size” selection box changes according to the selected
“Comm Format” (the “number of bits” label shown in Figure 63 is “8-bit”). As
the gateway will reject any connection requests that attempt to access data
past the upper boundary of the database, Equation 3 can be used to
determine if the overall requested size is valid. If the result of Equation 3 is
less than or equal to 4095 (4kbytes), then the gateway will not reject the
connection request.
Address
Start
Data
Produced
)
8
bits
of
number
(
x
size
+
Equation 3
Output:
The Output Assembly is the collection of command & configuration
data that is sent as an output from the PLC and consumed by the gateway.
The starting address for consumed data is specified by the Consumed Data
Start Address (refer to section 8.7.6.1). The Output Assembly Instance must
be set to 100 when connecting to the vendor-specific I/O assembly
instances, and the size must be set to the number of elements (each of
“Comm Format” type) that we wish to send to the gateway. In a similar
manner as the input assembly previously discussed, Equation 4 can be used
to determine if the overall requested size is valid. If the result of Equation 4
is less than or equal to 4095 (4kbytes), then the gateway will not reject the
connection request.
