Types And Startup Of Communications For Io-Link Systems; Types Of Communications For Io-Link Systems; Starting Communications Between The Controller And The Io-Link Master; Starting Io-Link Communications Between The Io-Link Master And The Io-Link Devices - Omron NX Series User Manual

6 IO-Link System Communications
6-1
Types and Startup of Communica-
tions for IO-Link Systems
This section describes the types of communications in the IO-Link Systems and also how to start the
communications.
6-1-1

Types of Communications for IO-Link Systems

There are the following two types of communications in an IO-Link System.
• Communications between the controller and the IO-Link master
• IO-Link communications between the IO-Link master and the IO-Link devices
Both cyclic communications and message communications can be used for these.
6-1-2
Starting Communications between the Controller and the IO-
Link Master
The methods of starting communications between the controller and the IO-Link master depend on the
controller and communications network in the system configuration.
Refer to the user's manual for the connected controller or Communications Coupler Unit for details.
6-1-3
Starting IO-Link Communications between the IO-Link Master
and the IO-Link Devices
IO-Link communications start automatically if the following three conditions are met.
• The I/O cables are connected.
• The Unit power supply to the IO-Link Master Unit is ON.
• The I/O power supply to the IO-Link Master Unit is ON.
The above three power supplies can be turned ON in any order.
However, if you are using the connected device verification function and the registered configuration
settings of the IO-Link devices do not match the actual configuration settings of the IO-Link devices,
IO-Link communications for those ports will not start.
The method of starting IO-Link communications differs as described below, depending on whether or
not you verify the connected device configuration.
Precautions for Correct Use
• If you do not enable verification with the IO-Link Device Verification Setting, errors will not
be detected for an IO-Link System even if unwanted IO-Link devices are connected.
We therefore recommend that you enable verification with the IO-Link Device Verification
Setting.
• Connected devices can be verified for only IO-Link devices. If a non-IO-Link device is con-
nected when the connected device verification function is enabled and the communications
mode is set to IO-Link Mode, an IO-Link communications error will occur.
6-2
NX/GX-series IO-Link System User's Manual (W570)