6-2
Section
Settings with the NT-series Support Tool
72
strobe status. If the strobe ON time is shorter than the CPU Unit’s cycle time, the
Master may not read changes in the PT’s status properly.
Strobe signal
(PT
→
Master)
Strobe ON time
(30 to 100 ms)
6-2
Settings with the NT-series Support Tool
This section explains the settings required at the Support Tool when using a PT
with a DeviceNet Interface Unit installed. Refer to the PT’s manuals for details on
other settings required to use the PT. Refer to the Support Tool’s Operation
Manual for details on basic Support Tool operations.
6-2-1 Setting the PT Model and PC Model
The PT model and PC model must be set as follows at the PT to which the Devi-
ceNet Interface Unit is installed.
PT Model:
For an NT31:
NT31-V1 (System Ver.2.1)
For an NT31C:
NT31C-V1 (System Ver.2.1)
For an NT631:
NT631-V1 (System Ver.2.1)
For an NT631C:
NT631C-V1 (System Ver.2.1)
PC Model (PLC Vendor):
MEMLINK (Memory Link)
Set the PT model and PC model (PLC Vendor) in the PT Type Tab of the Support
Tool’s PT Configuration Dialog.
6-2-2 Allocating Required Areas and Elements in PT Memory
In order to use the PT, the PT status control/notify areas, memory tables, and
elements must be allocated in the host’s area (called PT memory when using the
Memory Link.)
When using the DeviceNet Interface Unit to communicate with the host (Master),
it is necessary to plan the allocation of the input and output areas in PT memory
at the same time that you decide on the allocation of the PT status control/notify
areas, memory tables, and elements.
Reference 1. The input and output areas are regularly accessed from the host by remote
I/O communications, so allocate areas and elements that are refreshed fre-
quently. The input area is only read from the host and the output area is only
written from the host.
Parts of PT memory outside of the input and output areas are accessed by
explicit messages sent by the host, so it is best to allocate areas and data
that aren’t changed often. On the other hand, this area can be used for two-
way read/write access from the host, so consider allocating parts of PT
memory outside of the input and output areas to frequently refreshed data if
two-way data transfer is required.
Refer to 6-3 Allocating PT Memory to the Host (Master) for details on allocat-
ing PT memory for the input and output areas.
2. Since the input and output areas are allocated in the PT’s system menu, the
allocation is not checked from the Support Tool. There is no check to prevent
the output area that is written from the host from being allocated as an area
that is written from the PT.
