6 Process Data Communications and SDO Communications
6-2
NJ/NX-series CPU Unit Built-in EtherCAT Port User’s Manual (W505)
6-1 Process Data Communications (PDO
Communications)
Process data communications cyclically exchanges data between the master and slaves in the process
data communications cycle (i.e., the task period of primary periodic task or priority-5 periodic task).
From the user program in the NJ/NX-series CPU Unit, slave data is accessed through allocated vari-
ables.
You can use the priority-5 periodic task only with the NX701 CPU Units.
The variables that are allocated depend on the slave type as shown in the following table.
Allocated variables are specified for parameters of instructions in the user program.
The user program in an NJ/NX-series CPU Unit can read and write EtherCAT slave process data that is
not assigned to axes through device variables. (The slave process data is I/O data that is exchanged
between the master and slaves in each period.)
6-1-1 Allocated Variables for Process Data Communications
Slave type Allocated variables
Operation screen in
Sysmac Studio
EtherCAT slaves which are not
assigned to axes
Device Variables I/O Map
EtherCAT slaves which are
assigned to axes
Axis Variables Axis Settings
Device Variables
EtherCAT
Slave Slave
Process dataProcess data
Device variables
Reading and writing
User program
NJ/NX-series CPU Unit
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