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Commissioning
Bit Alignment
Mode (IEC/984)
The 140 NOA 622 00 has two bit alignment modes for binary I/O modules:
l IEC Mode
l 984 Mode
Using these two modes, you can define the order of the I/O bits in the I/O words (not
mirrored / mirrored). The following sections show the difference between both
modes.
The bit alignment of the analog I/O modules remains the same in both modes.
To select the bit alignment mode in Concept, open the parameter dialog box for the
NOA module.
Additionally, there is also the difference in data mapping when using 0x/1x or 3x/4x
registers.
Binary 16 Bit I/O
Modules
(in 3x/4x Range)
The addressing of binary 16 bit I/O modules takes place according to the following
scheme:
Bit order in
state RAM
(3x/4x)
Bit order in
INTERBUS Word
(viewed using
Bus Configuration
Tool)
Inputs/Outputs
(on terminals)
Binary 16 Bit I/O
Modules
(in 0x/1x Range)
984 Mode
15
14
13
...
2
1
0
15
14
13
...
2
1
0
15
14
13
...
2
1
0
15
14
13
...
2
1
0
1
2
3
...
14
15
16
1
2
3
...
14
15
16
The addressing of binary 16 bit I/O modules takes place according to the following
scheme:
Bit order in
state RAM
(0x/1x)
Bit order in
INTERBUS Word
(viewed using
Bus Configuration
Tool)
Inputs/Outputs
(on terminals)
840 USE 497 00 June 2005
IEC Mode
IEC Mode
984 Mode
15
14
13
...
2
1
0
15
14
13
...
2
1
0
15
14
13
...
2
1
0
15
14
13
...
2
1
0
1
2
3
...
14
15
16
1
2
3
...
14
15
16
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