4-3
I/O Allocation Section 4-2
Remote I/O Com-
munications
4-2-1 Allocation Area Size
The size of allocated data in each of the IN and OUT Areas is shown in the
following table.
Note (1) When the master is a CS/CJ-series DeviceNet Unit, the IN Area can be
divided into two areas (IN Area 1 and IN Area 2). Any allocation data from
the list of parameters can be allocated in each area.
(2) The actual size of the allocated area depends on the size of allocation
data selected.
(3) The default allocation data size is two bytes.
When the allocation data size is two bytes, the monitor and setting data will be
displayed in the range FFFF hex to 0000 hex. Data will be fixed at 7FFF hex
or 8000 hex if the data exceeds the range that can be displayed. For example,
−32769 would be displayed as 8000 hex.
The following data sizes are fixed, however.
• General status: 2 bytes (fixed)
• E5AR/ER-DRT status: 4 bytes (fixed)
• E5AR/ER-DRT Output Enable Bits and operation commands: 2 bytes
(fixed)
Note Refer to 4-2-6 Input Data on page 4-11 for details on General Status. Refer to
4-2-7 Output Data on page 4-11 for details on Output Enable Bits and opera-
tion commands.
Allocation data sizes are specified for the IN Area I/O allocations and OUT
Area I/O allocations. If the allocation data size is 4 bytes, up to 50 allocations
can be set. Any allocations set beyond that limit will be invalid. If the total allo-
cated area for IN Area 1 and IN Area 2 exceeds the maximum number of
words (100 words), the items allocated in IN Area 2 that exceed the maximum
number of words will be invalid.
4-2-2 Allocation Parameters
The parameters that can be allocated are shown below. These parameters
can be broadly classified as E5AR/ER-DRT status bits/operation commands,
and E5AR/ER-DRT operation data and setting data.
1. E5AR/ER-DRT Status Bits/Operation Commands
The status bits and operation commands for the E5AR/ER-DRT Digital
Controller are shown in the following table.
Note (1) When items that are write-only are allocated in the IN Area, they are al-
ways set to 0.
I/O memory Words Bytes Setting
Allocated data
size: 2 bytes
Allocated data
size: 4 bytes
IN Area 0 to 100 0 to 200 100 50
OUT Area 0 to 100 0 to 200 100 50
Read Write Item
Yes No General status
No Yes Operation commands
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