GE PACSystems RX7i, User Manual

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Chapter 4. Configuration
GFK-2224Q January 2017 63
Destination Identifies the data’s consuming device, based on the Destination Type selected:

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 at
the end of the next 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 to the nearest 2 milliseconds.
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.
Reply Rate
Not used.
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.
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.
Ref Address The PLC memory reference address that contains the start of the data for this variable.
Ignore
Not used for Produced exchange.
Length Size of the data for this variable, expressed in units of the selected PLC reference
memory type.
Type Data type of the selected PLC reference memory type. (Automatically set up by the Ref
Address selection.)
Description
An optional text description of this variable.
To add a new variable to the end of the exchange, click the ‘ Add’ button. This does not change the data offsets
of any existing variables within that exchange.
To insert a new variable among the existing variables, click on an existing variable. When you click the ‘
Insert’
button, a new variable will be created
ahead
of the selected existing variable. This changes the data offsets of
all subsequent variables in the exchange.
Once a new variable has been entered, double-click a data field within the row to edit that value.
To delete an existing variable, click on the variable row and then click the ‘
Delete ’ button.
The sum of all variables in the exchange must not exceed 1400 bytes. The total length of the exchange (in
bytes) is displayed as ‘ Length (Bytes): ’ at the top of the exchange window above the variable list. PACSystems
CPUs with firmware version 5.0 and later support a maximum of 30,000 variables for all exchanges. Earlier
firmware versions support approximately 12,000 variables for all exchanges.