Omron WS02-9094G - V1.0 Operation Manual page 51

CS1/CJ1W-PRM21 PROFIBUS Master DTM
Note
!Caution The default mapping of areas on to the PLC memory is the same default map-
Mapping Area Controls
Note
36
1. When mapping, the modules are copied from the module list to the map-
ping Area and not moved. This means that the module list acts as a re-
source for the two Mapping Areas, below the module list.
2. When adding/removing slaves/modules, and Auto Addressing has been
enabled, the modules in the Areas will be remapped. This usually results in
I/O data being re-mapped. Therefore it is recommended to select all slaves
and modules, before setting up the PLC memory mapping configuration.
ping as used in the CS1/CJ1W-DRM21 Devicenet Master/Slave Unit. Care
should be taken to avoid data overlap, if such a Unit is part of the same PLC
CPU system as the CS1/CJ1W-PRM21 PROFIBUS Master Unit.
Each mapping Area in the Allocation tab is equipped with four controls and an
information field located below the Area. The controls and information field
are listed and explained in the table below.
Control
Area box
Start Address box
Length box
Occupied: field
Compress button
1. If the selected PLC memory area, on to which the data must be mapped is
not supported by the PLC CPU, a warning message will be displayed upon
downloading the configuration.
2. If an invalid setting is made the Occupied length value will change its co-
lour to red, indicating an invalid setting. In addition, a warning message will
be displayed, upon saving the changes. Invalid settings are for example
• The start address and length definitions of the data block will cause it
to exceed the area in the PLC.
• The data mapping of two or more I/O Areas (Output and/or Input) will
be overlapping each other partly or totally in the PLC memory.
Description
Selects the PLC memory area to which the associated
I/O Area will be mapped. Possible options are:
• Not Used (List must be empty).
• CIO
• DM
• Work
• HR
• EM Bank 0 to 12 (Decimal)
(See Note 1).
In this field the user can enter the start address in the
PLC memory of the mapped data block.
The length box allows the user to select the number of
visible rows. The minimum and the default value is 100
words. If more than 100 words are configured, the mini-
mum Length value will be that number.
The user can set the Length value to up to 7168 words.
This field display the actual length of the data block (not
necessarily the same as the amount of data in it). This
length includes both data and any gaps between mod-
ules. Gaps may only be there if Auto-Addressing option
in the Master Setup tab is disabled.
(See also Note 2).
Pressing the Compress button will compress the Area
list associated with it, i.e. this action will remove all gaps
from the mapping list by moving all mapped I/O modules
as close to the start of the memory area as possible.
(See Notes 3 and 4).
Section 2-3