6-9SectionSystem Settings
134
The operation at the start is as follows.
Display of the System Initialization Screen
When
establishing the communication
with a host, the System initializing char
-
acter
string is displayed on the screen. If the communication with
the host cannot
be established, the System initializing screen remains up. If this is the case,
check the settings at the host and the PT side, the cables and wiring.
In
addition, creating screen number 9000 enables the display of a screen
other
than the System initialization screen.
Transmission of the Contents of Memory Tables
If
the Resume Function memory switch is set to ON, or if
the initial values of the
memory
tables are
used, the contents of the numeral/character-string memory
tables are copied to the allocated words at the host.
↓
Display of the Startup Screen
The
startup screen is displayed on reading the contents (screen number of the
screen to be displayed) of the first word of the PT Status Control Area.
If
the contents are not correct for a screen number
, or there is no data
registered
for the set screen number, an error message is displayed.
Execute the host program and confirm that the following operations are per-
formed normally.
• Confirm that the NT21 screens switch in accordance with the host program.
If the screens do not switch correctly, check the connection between the
host
and the NT21, and also check if the hardware settings are correct.
For
details,
refer to
Section
4 Connecting to the Host from the RS-232C Por
t, or
Section 5 Connecting to the Host from the RS-422A/485 Port.
• Confirm
that
the operation results of touch switch and numeric value/character
string input
at the NT21 are sent to the host correctly by displaying the contents
of the host words and bits using a Programming Device (e.g., CX-Program-
mer).
If the results of operations at the NT21 are not sent to the host correctly,
check
the setting of the display elements. For details on setting display ele
-
ments, refer to the description of each display element in the Reference
Manual.
6-9 System Settings
The
NT21 supports a variety of functions that are convenient during operation
to
be
set with memory switches. This section describes the memory switch settings
relating to the operation environment.
Since
the memory switch settings are backed up to the flash memory by the bat
-
tery in the NT21, they are not cleared when the power is switched OFF.
6-9-1 Memory Switch Setting Screens
There
are four memory switch setting screens. The required screen can be dis
-
played
by using the [
] (next screen) and [
] (previous screen) touch switches.
Checking
Communications
between the NT21 and
the Host
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