Operation
Section 4-3
37
From the Slave Configuration panel, all other slaves can be accessed by
selecting them from the ‘Actual slave’ drop-down box.
The items ‘DPV1 Settings’, ‘Predefined Modules’ and ‘Symbolic Names’ are
not applicable to the C200HW-PRM21.
I/O configuration
If a predefined I/O configuration is made in the GSD file, this will be entered in
the module list automatically, and no further modules can be added.
In case of user-configurable modular slaves, select the required modules from
the list, either by double clicking, or using the buttons ’Append Module’ or
‘Insert Module’.
For further configuration of the slave, a button provides access to the
parameter data entry panel.
Auto-addressing
When Auto-addressing is enabled (through Settings – Master Configuration),
no further configuration of the I/O data assignment is required. The allocation
of the slave’s I/O data to the Master’s I/O buffers will be made automatically
before downloading the configuration to the Unit, or when viewing the address
table.
When Auto-addressing is disabled, the user must make sure that each slave
is allocated a sufficiently large area of the Unit’s buffers. When a slave’s I/O
data is found to be overlapping with another slave, an error message will be
generated when attempting to download. It is allowed to create gaps in the
slave’s allocations to the buffers, to anticipate an extension of the network in a
later stage. This will however result in a less than optimal data transfer
between the Unit and the PLC CPU.
I/O data allocation
The ‘Type’ indicator of each module denotes the slave module’s data format:
IB for byte inputs
QB for byte outputs
IW for word inputs
QW for word outputs
and the lengths of each module’s input and output data are listed under the
headings ‘I Len.’ and ‘O Len.’, respectively.
The locations of each modules’ I/O data in the buffers of the Master Unit can
be adapted by the user, specifying an offset in Words under ‘I Addr.’ and ‘O
Addr.’.
Manually entered offset assignments are automatically checked before being
downloaded into the C200HW-PRM21. See 4-3-8, ‘Download’.
The example below shows:
•
One module (Slot=1) which has two indexed sub-modules (Idx=1, Idx=2)
•
Submodule 1-1 has:
1 input word, starting at word 11 of the input buffer
1 output word, starting at word 9 of the output buffer
•
Submodule 1-2 has:
16 input bytes, starting at word 12 of the input buffer
4 output bytes, starting at word 10 of the output buffer
Содержание C200HW-PRM21
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