Block Mapping - Leroy-Somer digitax st User Manual

Table 12.6 shows the mapping parameters where five IN and five OUT cyclic data
channels are required. With data compression disabled each data channel uses 32-bits
(two data words, so a total of ten words are required, Pr MM.05 = 10).
Table 12.6 Example cyclic data channel mapping with compression off
Data channel
IN channel 0
IN channel 1
IN channel 2
IN channel 3
IN channel 4
OUT channel 0
OUT channel 1
OUT channel 2
OUT channel 3
OUT channel 4
It is advisable to keep 16-bit parameters paired together. This prevents mis-alignment of
cyclic data with 32-bit PLC registers when using auto-mapping facilities to configure the
PROFIBUS-DP network. By swapping the mappings for input channel 1 with input
channel 2 and moving output channel 4 to output channel 1, the data channel structure
will appear as shown in Table 12.7.
Table 12.7 Compressed cyclic data channel mapping
Data channel
IN channel 0
IN channel 1
IN channel 2
IN channel 3
IN channel 4
OUT channel 0
OUT channel 1
OUT channel 2
OUT channel 3
OUT channel 4
12.6

Block mapping

On SM-PROFIBUS DP-V1 there are ten mapping parameters available for both input
and output mappings. If more than ten mappings are required then block mapping must
be used to achieve this. Block mapping is configured by placing ascending parameters
(within the same menu) into consecutive mapping parameters. Consider the example in
Table 12.8.
Block mapping is only available when using Pr 18.xx, Pr 19.xx, Pr 20.xx and on the PLC
NOTE
registers within SM-Applications.
76
Data words Mapping
used for slot 3
IN word 0, 1 Pr 17.10
IN word 2, 3 Pr 17.11
IN word 4, 5 Pr 17.12
IN word 6, 7 Pr 17.13
IN word 8, 9 Pr 17.14
OUT word 0, 1 Pr 17.20
OUT word 2, 3 Pr 17.21
OUT word 4, 5 Pr 17.22
OUT word 6, 7 Pr 17.23
OUT word 8, 9 Pr 17.24
Data words Mapping
used for slot 3
IN word 0 Pr 17.10
IN word 1 Pr 17.11
IN word 2, 3 Pr 17.12
IN word 4 Pr 17.13
IN word 5 Pr 17.14
OUT word 0 Pr 17.20
OUT word 1 Pr 17.21
OUT word 2, 3 Pr 17.22
OUT word 4, 5 Pr 17.23
OUT word 6, 7 Pr 17.24
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Data
Setting Mapping status
width
1040 16-bit Pr 10.40, status word
201 32-bit Pr 2.01, post-ramp speed ref
Pr 4.20, motor load as% of
420 16-bit
rated motor load
1421 16-bit Pr 14.21, PID feedback
1401 16-bit Pr 14.01, PID output
642 16-bit Pr 6.42, control word
121 32-bit Pr 1.21, digital speed ref 1
211 32-bit Pr 2.11, acceleration ramp
221 32-bit Pr 2.21, deceleration ramp
1420 16-bit Pr 14.20, PID reference
Data
Setting Mapping status
width
1040 16-bit Pr 10.40, status word
Pr 4.20, motor load as% of
420 16-bit
rated motor load
201 32-bit Pr 2.01, post-ramp speed ref
1421 16-bit Pr 14.21, PID feedback
1401 16-bit Pr 14.01, PID output
642 16-bit Pr 6.42, control word
1420 16-bit Pr 14.20, PID reference
121 32-bit Pr 1.21, digital speed ref 1
211 32-bit Pr 2.11, acceleration ramp
221 32-bit Pr 2.21, deceleration ramp
SM-PROFIBUS-DP User Guide
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