Omron CJ1W-PNT21 Operation Manual page 110

Configuring the IO Controller
7-4-4 IO Device Area
Example
Note
!Caution
96
The I/O data of all IO Devices can be mapped on to the PLC memory areas.
through two Output Areas and two Input Areas. The Output data can be
distributed over two Output Areas, each of which can be mapped on to PLC
memory. Similarly, the Input data can be distributed over two Input Areas,
each of which can be mapped on to PLC memory.
The figure below shows the CJ1W-PNT1 IO Controller DTM's IO Device Area
sub item for an example network with 4 IO Devices.
By default all Output data is mapped on to Output Area 1, and all Input data is
mapped on to Input Area 1. Each of these Areas can be mapped on to PLC
memory independently of each other.
Changing the mapping can be achieved using drag & drop. The module which
is mapped to Area 1 and which must be mapped to Area 2, can be copied
there by dragging it from the overall module list on top to Area 2.
1 By default the Auto-Addressing option will be enabled (see the sec-
tion IO Controller Setup). If any I/O modules are moved from one
Area to another, the I/O modules in first Area are re-mapped to close
all the gaps between mappings.
2 Prior to download, the CJ1W-PNT21 IO Controller DTM will check
the mappings for possible Area overlaps, PLC memory overlaps and
non-existing EM banks. If an error is detected, download will be
aborted and the necessary correction must be made first.
When mapping the I/O Areas, make sure that the I/O data will not overlap the Unit's
own CIO Area or one or more of the I/O data areas of any other PLC CPU or I/O Unit.
The CJ1W-PNT21 IO Controller DTM does not check this. Failure to avoid this, will lead
to unpredictable behaviour of the Unit, other units or the PLC.
Figure 7.12: IO Device Area
Section 7-4