Omron CJ1W-DRM21 Operation Manual page 164

4 Remote I/O Master Communications
d) The start bit for node addresses can be bit 00 or bit 08. If it is bit 08 however, 2 or more
bytes cannot be allocated as shown below.
e) Multiple masters cannot share the same slave.
You can determine whether there are duplicate node addresses in the I/O allocations (scan
lists) that were created simply by conducting a master parameter file duplicate check from
the CX-Integrator.
f) Be sure to use user-set allocations and operate with the scan list enabled if multiple mas-
ters are connected to a single network. A Bus OFF errors will occur if multiple fixed alloca-
tions masters operating with the scan list disabled are present on a single network.
g) You can include multiple Master Units in a single CPU Unit as shown below using user-set
allocations (16 Units max.).
Step 3: Define User-defined Variable
To access the area where the slave is allocated from the user program, a user-defined variable that
specifies the AT specification of that area needs to be defined.
Example of User-set Allocations Using the CX-Integrator
Node
address
Slave types
setting
16 output pts 00
Combination of 8 input
and output pts 01
Combination of 16 input
02
and output pts
03
8 input pts
10
32 output pts
Node
address
Slave types
setting
48 input pts
04
8 input pts 09
Combination of 8 output
12
and 16 input pts
4-24
Start byte
Master
Master
Slave
Master Unit
Master Unit
Slave
Slave
Allocation status
Node
address Output Input
00 16 pts 0 pts CIO 1950
01 8 pts 8 pts CIO 1951
02 16 pts 16 pts CIO 1952
03 0 pts 8 pts CIO 1953
10 32 pts 0 pts CIO 1954
Node
address Output Input
04 0 pts 48 pts 01000
09 0 pts 8 pts
12 8 pts 16 pts
CJ-series DeviceNet Units Operation Manual for NJ-series CPU Unit(W497)
OUT area
OUT block 1
1 5 0 0
Allocation (00)
CIO 1900
Allocation (01) Not used CIO 1901
Allocation (02)
Allocation
(10)
Allocation
OUT block 2
15 00
Not used Allocation (12)
IN area
IN block 1
1 5 0 0
Allocation (02)
Allocation (01) Allocation (03)
IN block 2
15 00
Allocation
10 wd
Allocation
11 wd
(04)
Allocation
12 wd
Not used
13 wd
Allocation (12)
14 wd
Not used
Allocation (09)
15 wd