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5 I/O Refreshing Methods
5 - 2
NX-series Position Interface Units User’s Manual (W524)
5-1
I/O Refreshing for Slave Terminals
This section first describes I/O refreshing for NX-series Slave Terminals.
It then describes operation when the built-in EtherCAT port on the NJ/NX-series CPU Unit is used for
communications with an EtherCAT Slave Terminal.
The CPU Unit performs I/O refreshing cyclically with the Slave Terminals through the Communications
Master Unit and the Communications Coupler Unit.
The following four cycles affect operation of the I/O refreshing between the CPU Unit and the NX Units
in an Slave Terminal:
(a) CPU Unit cycle time
(b) Host network communications cycle
(c) Refresh cycle of the NX bus
(d) Refresh cycle of each NX Unit
The cycle time of the CPU Unit, the communications cycle of the host network, and the NX bus I/O
refresh cycle are determined by the model of the CPU Unit and the type of communications.
The operation of I/O refreshing is as follows when the built-in EtherCAT port on the NX-series CPU Unit
is used for communications with an EtherCAT Slave Terminal.
• The (b) process data communications cycle and (c) refresh cycle of the NX bus in the above figure
are automatically synchronized with the (a) task period of the primary periodic task or priority-5 peri-
odic task in the CPU Unit if the distributed clock is enabled in the EtherCAT Coupler Unit.
• The (d) refresh cycles of the NX Units depend on the I/O refreshing methods, which are described
later.
I/O Refreshing from the CPU Unit to the Slave Terminals
NX-series CPU Units and I/O Refresh Operation
CPU Unit
Data exchange between user
program and I/O Units
Slave Terminal
NX Unit
NX Unit
NX Unit
Other communications slave
Communications
path
(a)
(b)
(d)
(d)
(d)
(c)
Commu-
nications
Master
Unit
Communi-
cations
Coupler
Unit
Summary of Contents for NX-EC0112
Page 13: ...11 Manual Structure NX series Position Interface Units User s Manual W524...
Page 34: ...Revision History 32 NX series Position Interface Units User s Manual W524...
Page 36: ...Sections in this Manual 34 NX series Position Interface Units User s Manual W524...
Page 78: ...3 Part Names and Functions 3 8 NX series Position Interface Units User s Manual W524...
Page 108: ...4 Installation and Wiring 4 30 NX series Position Interface Units User s Manual W524 Unit...
Page 114: ...4 Installation and Wiring 4 36 NX series Position Interface Units User s Manual W524...
Page 126: ...5 I O Refreshing Methods 5 12 NX series Position Interface Units User s Manual W524...
Page 340: ...8 Pulse Output Units 8 76 NX series Position Interface Units User s Manual W524...
Page 462: ...Appendices A 74 NX series Position Interface Units User s Manual W524...
Page 463: ...I 1 I NX series Position Interface Units User s Manual W524 Index...
Page 466: ...I 4 NX series Position Interface Units User s Manual W524 Index...