6-2
Section
Settings with the NT-series Support Tool
73
The following three control and notify areas must be allocated in PT memory in
order for the PT to be used.
•
PT status control area (5 words)
•
PT status notify area (3 words)
•
Window control area (9 words)
(It isn’t necessary to allocate these words when the PT’s window functions
aren’t being used.)
Allocate the control/notify areas in the Control/Notify Area Tab of the Support
Tool’s PT Configuration dialog. Set the leading PT memory address being allo-
cated to each area in the PC address setting columns.
Reference 1. Data in the PT status control area and PT status notify area has to be ex-
changed frequently with the host (Master), so allocate these areas to the
DeviceNet Interface Unit’s output and input areas as shown below if at all
possible.
•
PT status control area: In the DeviceNet Interface Unit’s output area
•
PT status notify area:
In the DeviceNet Interface Unit’s input area
2. When the DeviceNet Interface Unit is being used, the first word of the PT
status notify area indicates the screen number of the screen currently being
displayed at the PT. For this reason, the PT status notify area requires one
word more than it does with the regular Memory Link.
3. The control/notify area settings registered in the PT can be displayed with
the PT Settings screen from the PT’s system menu. Refer to 5-6 Checking
the PT Settings for details.
Allocate elements such as memory tables, lamps, or touch switches in PT
memory when displaying the contents of host (Master) words on the PT screen
or notifying the host (Master) of the results of PT operations.
Make allocation settings for numeral memory tables, character string memory
tables, and bit memory tables with the Support Tool’s Table screen. Make alloca-
tion settings for each element in each element’s properties.
Data in the input and output areas is transferred in only one direction, so be sure
to allocate data based on its usage, i.e., whether it is being transferred from
PT
→
Host, Host
→
PT, or PT
↔
Host.
It is important to consider the direction of data flow (PT
→
Host, Host
→
PT, or
PT
↔
Host) and number of words required when allocating the PT’s control/
notify areas, memory tables, and data such as elements to the output and input
areas. Use the following table for reference.
Area or data type
Allocation size
Allocation to input or output area
Input area
(PT
→
Host)
Output area
(Host
→
PT)
PT status control area
5 words, fixed
×
n
PT status notify area
3 words, fixed
f
×
Window control area
9 words, fixed
n
n
Numeral memory table
1 or 2 words
(See note 1.)
n
n
Character string memory
table
1 to 20 words
(See note 1.)
n
n
Bit memory table
1 bit
×
f
Lamp (lamp bit)
1 bit
×
f
Touch
Notification bit
1 bit
f
×
switch
Lamp bit
1 bit
×
f
f
:
Allocation OK
n
:
The functions are limited to the allocated area’s transfer direction.
×
:
Allocation not possible
Allocating Control/Notify
Areas
Allocating Data
Area/Data Type and
Output/Input Area
Allocation
