Omron CJ1W-DRM21, CS1W-DRM21 Connections Using Allocations, Setting Connection Type

DeviceNet ConnectionsAppendix B

Connections Using Allocations

Allocation method		Contents
Without Con-	Fixed allocation (scan	Only 1 connection, automatically selected by
figurator	list disabled or	the DeviceNet Unit. (Either a polling or bit-
	enabled)	strobe connection is used.)
	User-set allocations	Only 1 connection, automatically selected by
	using allocated DM	the DeviceNet Unit based on the I/O area
	Area word settings	set in the Master User Allocations Table.
With Configu-	User-set allocations	The user can select the connection to be
rator	using Configurator	used for each node address with the Config-
		urator e.g., poll could be used for data and
		COS could be used for status. Automatic
		selection or user selection can be specified.
		Two connections can be used simulta-
		neously for one slave (but COS and cyclic
		cannot be used simultaneously.)

Setting Connection Type

The settings for remote I/O communications connections differ depending on the allocation method, as outlined below.

Fixed Allocation or User-set Allocations Using Allocated DM Area Words

The Master CS/CJ-series DeviceNet Unit automatically selects either poll or bit-strobe, whichever makes the communications cycle time shortest.

User-set allocations Using Configurator

The Master CS/CJ-series DeviceNet Unit can make an automatic selection, the same as above, or the user can select up to two connections for a Slave. The setting method is outlined below.

1.Select the Master Node in the Network Configuration Window in the Configurator.

2.Select Device – Parameters – Edit – All Masters and select the corresponding Slave. Click the Detailed Settings Button.

3.On the Connection Tab Page shown below, select a check box.

•Automatic selection

•User selection

Select up to two connections from poll, bit–strobe, COS and cyclic. COS and cyclic connections cannot be used at the same time.

COS send switch OFF to ON
I/O refresh	Time

CPU Unit user program

COS send instruction

DeviceNet Unit

Communications cycle	Communications cycle	Communications cycle	Communications cycle
time	time	time	time

Slave

I/O using normal connection COS output

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