5-6
Registering Device Variables
Device variables are used to access data in devices (slaves and Units).
This data is accessed through a port that acts as an interface to an external device. This logical port is
called an "I/O Port".
To make the values of the I/O on the Safety I/O Units, Safety I/O Terminal and the other Safety CPU
Unit available in the safety program in the Safety CPU Unit, you must register device variables for the
I/O ports on the Safety I/O Units, Safety I/O Terminal and the other Safety CPU Unit.
This section describes how to assign device variables to I/O ports through the I/O Map of the Safety
CPU Unit.
l
Registering New Variables or Creating Them Automatically
If the Controller configuration and the external devices to connect are finalized before you register
the variables that are used in the program, you can create the device variable for the I/O ports by
manually entering the device variable name, or by creating them automatically.
1 On the Safety CPU Unit Setup and Programming View, select Configurations and Setup and
double-click I/O Map.
The I/O Map will be displayed.
Automatically create the
device variable name.
DeviceName_PortName
If the safety I/O terminals to
which devices are connected
are set to Dual Channel Mode,
an error occurs if you attempt
to allocate an odd-numbered
terminal.
2 Select an I/O port in the I/O Map for the Safety CPU Unit, and enter a variable name directly in
the Variable
Column. Or, select a Unit or I/O port, and then right-click and select Create
Device Variable from the menu.
If you choose the Create Device Variable command, the device variables are automatically
named with the device name and port name. The device variables that you enter or automati-
cally create are registered in the global variable table.
5 System Configuration and Setup
5 - 26
NX-series Safety Control Unit User's Manual (Z930)
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