Omron NX Series User Manual page 36

1 Introduction to IO-Link Systems
Controller
• Communications
networks such as
EtherCAT
• NX bus
l Types of Data Exchange with the Ports on an OMRON IO-Link Master Unit
The OMRON IO-Link Master Units can perform the following types of data exchange with the IO-
Link devices through the ports.
Types of data exchange
through the ports
IO-Link communications
Digital inputs for pin 2
Digital signal inputs
Digital signal outputs
*1. This is possible only for IO-Link devices that support digital inputs for pin 2.
1-4
IO-Link Master Unit
One-to-one connection with
each IO-Link device
Cyclic communica-
tions
Message communi-
cations
You can use pin 2 to input digital signals in parallel with IO-Link communi-
*1
cations when faster response than for IO-Link communications is necessa-
ry.
These inputs can be connected to non-IO-Link sensors.
The IO-Link Master Unit functions as a digital input terminal or unit.
These outputs can be connected to non-IO-Link actuators.
The IO-Link Master Unit functions as a digital output terminal or unit.
Port
IO-Link devices (sensors,
actuators, etc.)
Function
Cyclic communications are used to share specific
parts of memory between the IO-Link Master Unit
and the IO-Link devices on a specific cycle.
Cyclic communications are the same as the process
data (PD) communications with the IO-Link protocol.
Message communications are used to access user-
specified data in the IO-Link devices from the con-
troller through the IO-Link Master Unit when neces-
sary.
Message communications are the same as the on-
request data (OD) communications in the IO-Link
protocol.
NX/GX-series IO-Link System User's Manual (W570)