Omron CS1W-DRM21 Fixed Allocations, Allocated Words, Backing Up the Scan List, Nications

Fixed Allocations Section 4-3

you disable the scan list with a Master Unit that is set for user-set allocations. Particularly when multiple Master Units are connected to a single network, communications will not be performed suc- cessfully if even one Master Unit on the network is operating with the scan list disabled. Once the list is disabled, the user-set allo- cations data registered in the Master Unit is lost.

Backing Up the Scan List

Fixed Allocations or User- set Allocations in Allocated DM Area Words

User-set Allocations from the Configurator

A scan list must be created to switch the DeviceNet Unit to operation with the scan list disabled or to replace a DeviceNet Unit. It is important to back up the list using one of the following methods:

Save the scan list as a backup file on Memory Card by turning ON the Setup File Backup Switch (word n+1, bit 15) in the words allocated in the CIO Area.

Save the scan list as a backup file on Memory Card or save it either as a net- work component file and master parameter file using the Configurator. In the preceding cases, turn ON the Setup File Restore Switch (word n+1, bit 14) in the words allocated in the CIO Area to input setup data, such as the scan list backed up on Memory Card, into a DeviceNet Unit.

4-3	Fixed Allocations
4-3-1	Allocated Words
		Words in the CS/CJ-series DeviceNet CIO Area in the CPU Unit are allocated.
		An area of words can be selected from one of three fixed allocation areas.
		Use a Software Switch to select the allocation area.
		Each area is comprised of an OUT area that is used to write output data to
		slaves and an IN area that is used for input from slaves in remote I/O commu-
		nications.
	Area	OUT area (word)	IN area (word)	Selection method
Fixed allocation area 1		CIO 3200 to CIO 3263	CIO 3300 to CIO 3363	Turn ON the Master Fixed Allocation Setting
				1 Switch (word n, bit 08).
Fixed allocation area 2		CIO 3400 to CIO 3463	CIO 3500 to CIO 3563	Turn ON the Master Fixed Allocation Setting
				2 Switch (word n, bit 09).
Fixed allocation area 3		CIO 3600 to CIO 3663	CIO 3700 to CIO 3763	Turn ON the Master Fixed Allocation Setting
				3 Switch (word n, bit 10).

A maximum of 3 DeviceNet Units can be included as masters in a single PC because the three allocation areas above are set individually for fixed alloca- tions. The default setting is fixed allocations area 1.

Each OUT/IN area is allocated to a slave according to its node address as shown below. Allocated words are determined by the node address in fixed allocations as shown.

				Node
Area 3	Area 2	Area 1	OUT area	address	IN area	Area 1	Area 2	Area 3
CIO 3600	CIO 3400	CIO 3200				CIO 3300	CIO 3500	CIO 3700
CIO 3601	CIO 3401	CIO 3201				CIO 3301	CIO 3501	CIO 3701
CIO 3602	CIO 3402	CIO 3202				CIO 3302	CIO 3502	CIO 3702
CIO 3661	CIO 3461	CIO 3261				CIO 3361	CIO 3561	CIO 3761
CIO 3662	CIO 3462	CIO 3262				CIO 3362	CIO 3562	CIO 3762
CIO 3663	CIO 3463	CIO 3263				CIO 3363	CIO 3563	CIO 3763

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