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8.7.5
16-bit parameter access
Normally six telegrams would be required to access drive parameters using Mode 1
non-cyclic data. When accessing16-bit data only four telegrams are required. If an
attempt is made to read a 32-bit parameter from the drive the parameter value will be
returned, provided that the parameter value does not exceed signed 16-bit limits. If the
value is larger than a signed 16-bit value, the ERR bit will be set. When writing data to a
32-bit parameter, the 16-bit data will be treated as a signed 16-bit data value. This limits
the range that can be written to a 32-bit parameter.
8.8
Mode 2 - PPO 4 Word mode
PPO 4 word mode of non-cyclic data is a simple method of accessing non-cyclic data
without the need for the telegrams required with Mode 1 non-cyclic data and its
associated overheads. Mode 2 has the disadvantage of using four words of mappings
and reduces the available free mappings accordingly.
8.8.1
Mapping for PPO 4 Word non-cyclic data
To configure an SM-PROFIBUS DP-V1 for PPO 4 word mode non-cyclic data, the
following steps must be performed:
1. Set Pr MM.05 to the required mode (see section 7.2 Data formats on page 24).
2. Set Pr MM.32 to ON to re-initialize SM-PROFIBUS DP-V1.
3. Save the parameters if required (see section 5.10 Saving parameters to the
drive for more information).
When the SM-PROFIBUS DP-V1 re-initializes, it will map cyclic data IN words 0 to 3
and OUT words 0 to 3 to the PPO 4 Word protocol parameter, Pr 61.51. All existing
mapping parameters will be moved down by one mapping, (i.e. the previous mappings
set in Pr MM.10 and Pr MM.20 will now appear in Pr MM.11 and Pr MM.21 respectively).
Table 8.7 shows what happens to the mapping parameters when the data format is
changed from 10 cyclic words (Pr MM.05=10) to 10 cyclic words with Mode 2 non-cyclic
data. (Pr MM.05=210).
Table 8.7 PPO 4 Word mode data mapping
Mapping
parameter
Pr 17.10
Pr 17.11
Pr 17.12
Pr 17.13 to
Pr 17.19
Pr 17.20
Pr 17.21
Pr 17.22
Pr 17.23 to
Pr 17.29
If all IN or OUT mapping parameters are being used when the data format change is
NOTE
implemented, the last mapping parameter value will be lost.
42
Before format change (Pr 17.05 = 10)
Value
Mapping
1040
Pr 10.40, status word
201
Pr 2.01, post ramp speed ref
0
Not mapped
0
Not mapped
642
Pr 6.42, control word
121
Pr 1.21, digital speed ref 1
0
Not mapped
0
Not mapped
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After format change (Pr 17.05 = 210)
Value Mapping
6151
Pr 61.51, PPO 4 Word
1040
Pr 10.40, status word
201
Pr 2.01, post ramp speed ref
0
Not mapped
6151
Pr 61.51, PPO 4 Word
642
Pr 6.42, control word
121
Pr 1.21, digital speed ref 1
0
Not mapped
SM-PROFIBUS DP-V1 User Guide
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