GE PACSystems RX7i, Руководство пользователя

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Chapter 4. Configuration
GFK-2224Q January 2017 59
Adapter Name The specific Ethernet Interface, identified by its rack and slot location within the
producing PLC.
Destination Type Specifies whether the data’s destination will be:
▪
An IP address (Unicast)
▪
A Group ID (Multicast)
▪
All EGD nodes on the subnet (Broadcast). Choosing broadcast will cause the EGD
packets to be received by any node on the network. This can impact performance if
there are non-EGD devices on the network. Check with the system’s network
administrator if you are unsure about whether to use Broadcast.
Destination Identifies the data’s consuming device, based on the Destination Type selected above:
▪
a dotted-decimal IP address if Destination Type is IP Address
▪
the group’s ID (1–32) if Destination Type is Group ID
▪
the value 255.255.255.255 if Broadcast IP is the Destination Type.
Produced Period The scheduled repetition period at which the data is produced on the network.
Configure a value in the range of 0 or 2–3,600,000 (2 milliseconds to 1 hour). The value
zero means data will be produced at the end of each PLC scan, but not less than 2
milliseconds from the previous production. Set the production period to ½ the period at
which the application needs the data in this exchange. Round this value up to the
nearest 2 milliseconds.
Reply Rate Not used.
Send Type
Fixed at “always.” In the PLC, production of EGD is controlled by the I/O state: when
enabled, EGD production is enabled, and when disabled, EGD production is disabled.
Run Mode Store
Enabled
When set to True, allows you to modify or delete this exchange and store the changes
while in Run mode. You can add exchanges in Run mode regardless of the setting of this
parameter.
It is recommended that you keep this parameter at its default setting, False, unless your
application has a specific need to modify this exchange in Run mode.
Network ID Allows the user to select either
LAN 1
or
LAN 2
for Multicast or Broadcast production.
Note: The
Network ID
field is only visible if the
Destination Type
is configured for
Multicast or Broadcast (not Unicast) AND the
Adaptor Name
selects a device rack/slot
that physically supports multiple LANs (for example, the CPE330).
Configuring the Exchange Variables
Double-clicking on the produced exchange opens a window for configuring the variables within the exchange.
Each exchange has its own variable list. These variables contain the data that is produced to the network. Each
variable contains the following information
Offset (Byte.Bit)
The location within the data area for this exchange where the start of the data for
this variable is located. The offset is expressed as Byte.Bit , where
Byte
is a zero-
based byte offset and Bit is a zero-based bit position within that byte. (Valid bit
values are 0 — 7. Bit 0 is the least-significant bit within the byte; bit 7 the most
significant.)
Variable The name defined for this variable. It may be an existing variable or it may be
defined using the variable declaration facilities of the programmer such as the
variable list in the Navigator.