Chapter 11 DeviceNet Remote I/O Module AHRTU-DNET
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The mapping address allocation for each module is independent and adding or deleting one module
will not affect the mapping addresses of other module. By doing so, the work load of modifying the
program can be reduced. Since the control over each module is comparatively independent in one
program, even if one or more modules are added or deleted, other module can still run normally and
no change is needed to make in the main program as long as the mapping range of the original
module is not changed
The range of mapping address of each module can be allocated automatically by the software or
allocated manually by users. Automatic allocation is easy and quick; the lengths of the input and
output mapping addresses are the shortest and the rate of data exchange on the bus is the highest.
While, manual allocation can reserve the mapping addresses of each module, adding or deleting the
mapping parameters of the module will not influence the mapping addresses of other module. The
lengths of the input and output mapping addresses of AHRTU-DNET-5A will be a bit longer and the
data exchange rate on the bus will be a bit lower due to the reserved mapping addresses.
Automatic allocation of the addresses
Click the “Auto-Addr” button on the interface, the software will automatically allocate the
parameter mapping addresses of the module according to the numbers from small to large of
the rack and the slot where the modules are. As above, AH06XA-5A is set to the present value
of 4 channels and 8 words input and the present value of 2 channels and 4 words output;
AH04DA-5A is of 4 channels and 8 words output by default and is configured with 2 parameters
“Mapping to the device” (2 words input and 2 words output); 16AP occupies 1 word of input
present value and 1 word of output present value and every word corresponds to one D in the
mapping area of the master (That is to map to PLC).
Suppose that the input and output mapping starting addresses which the master allocates to
AHRTU-DNET-5A are D1005 and D2005 respectively. The mapping addresses that the
software automatically allocates to each module are like this. For example, D2005 and D1005
are the control word and status word of AHRTU-DNET-5A respectively; then the corresponding
input and output mapping addresses for AH06XA-5A are D1006~D1013 and D2006~D2009
respectively; the corresponding input and output mapping addresses for AH04DA-5A are
D1014~D1015 and D2010~D2019 respectively; the corresponding input and output mapping
addresses for 16AP are D1016 and D2020 respectively.
16AP D1016 D2020
The input and output mapping addresses of AHRTU-DNET-5A are D1005~D1016 and
D2005~D2020 respectively.
Manual allocation of the addresses
Manual allocation of the addresses means to set the input and output mapping starting
addresses of each module by manual. Suppose one module currently needs to use 4 words of
input data and 4 words of output data, but it may use 8 words of input data and 8 words of output
data in the future. Set that the input and output mapping starting addresses of the module and
the last input and output mapping addresses of the previous neighboring module are
inconsecutive so that the mapping relations between the original module parameters and the D
registers will keep unchanged. While, by means of automatic allocation of addresses, the
mapping relations between the original module parameters and D registers will be changed if
the module needs to add some parameters. The input and output mapping starting addresses or
the offsets of the starting addresses of each module can be set and the input and output
mapping starting addresses of different modules can not be repeated, which the software can
count automatically. The mapping addresses of a single module are consecutive.
Add AHRTU-DNET-5A to Scan List on the Scanner Module Configuration interface before the
I/O module parameters of AHRTU-DNET-5A has not been configured. Suppose that the input
and output mapping starting addresses that the master allocates to AHRTU-DNET-5A are
D1005 and D2005 respectively.
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