Omron CJ1W-DRM21, Руководство по эксплуатации

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4 Remote I/O Master Communications
4-20
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
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.
z
User-set Allocations Methods
* You cannot use Holding Area H512 and its subsequent holding areas, or EM Area Bank D and its subsequent
banks.
Method Set through CX-Integrator
Set through Device Variables for CJ-
series Unit (Master User-set Alloca-
tions Setup Table)
Allocation areas in memory used
for CJ-series Unit
*
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)
No. of allocated blocks 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.
2 blocks: OUT 1 and IN 1
You can create OUT 1 and IN 1 any-
where in the above areas.
Block allocation order Any order
Node address 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 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.
Start bit for allocations Allocations can start from bit 00 or bit 08.
Allocations that start from bit 08 are in
1-byte units only. All allocations start from bit 00 (Cannot
start from bit 08. All allocations are in 1
word units.)
Allocation size Per block 500 words max.
Total size 2,000 words max. for a total of 4 blocks 1,000 words max. for a total of 2 blocks
Slave alloca-
tion limits Slaves with
more than 8
points The leftmost byte (bits 07 to 15) cannot be used.
Slaves with 8
points Allocated to the leftmost or rightmost bytes (not allocated a word)
Slaves with 16
points Allocated one word
Slaves with
more than 16
points Allocated multiple words (with an odd number of bytes, only the rightmost byte is
allocated in the last word)