User-Set Allocations - Omron CJ1W-DRM21 Operation Manual

4 Remote I/O Master Communications
4-4

User-set Allocations

With a CJ-series DeviceNet Unit, you can allocate remote I/O communication slaves in any area of a
memory used for CJ-series Unit (CIO, WR, HR, DM, or EM) with the use of one of the following meth-
ods:
• Setting through CX-Integrator
• Setting through device variables for CJ-series Unit (Master User-set Allocations Setup Table)
To access a given allocation area from the user program, a user-defined variable that specifies the AT
specification of that allocation area needs to be defined.
User-set Allocations Methods
Method
Allocation areas in memory used
*
for CJ-series Unit
No. of allocated blocks
Block allocation order
Node address order
Start bit for allocations
Allocation size Per block
Total size
Slave alloca- Slaves with
tion limits more than 8
points
Slaves with 8
points
Slaves with 16
points
Slaves with
more than 16
points
* You cannot use Holding Area H512 and its subsequent holding areas, or EM Area Bank D and its subsequent
banks.
4-20
Set through CX-Integrator
CIO: 0000 to 6143
WR: W000 to W511
HR: HR000 to HR511
DM: D00000 to D32767
EM: E _00000 to E _32767 ( =0 to C)
4 blocks: OUT 1, IN 1, OUT 2 and IN 2
You can create OUT 1, IN 1, OUT 2, and
IN 2 anywhere in the above areas.
Any order
Any order
Note 1 Node addresses do not have to
correspond between blocks.
2 One node address cannot be
allocated to different blocks.
Allocations can start from bit 00 or bit 08.
Allocations that start from bit 08 are in
1-byte units only.
500 words max.
2,000 words max. for a total of 4 blocks
The leftmost byte (bits 07 to 15) cannot be used.
Allocated to the leftmost or rightmost bytes (not allocated a word)
Allocated one word
Allocated multiple words (with an odd number of bytes, only the rightmost byte is
allocated in the last word)
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
Set through Device Variables for CJ-
series Unit (Master User-set Alloca-
tions Setup Table)
2 blocks: OUT 1 and IN 1
You can create OUT 1 and IN 1 any-
where in the above areas.
Allocations must be in order of node
addresses (0 to 63 in ascending order)
Note 1 Not all nodes need to be allo-
cated, reducing the number of
words required.
2 Node addresses do not have to
correspond between blocks.
All allocations start from bit 00 (Cannot
start from bit 08. All allocations are in 1
word units.)
1,000 words max. for a total of 2 blocks