GE AF-600 FP Metasys Operating Instructions Manual page 18

Example 3:
Over-ride analog output, speed (50%) change command:
Device address
Char1 command
Char1 subcommand
Char2 region
Char2 object number (NPA)
Char8 override value *
Checksum
Message code:
>XX7203004E000000<CR>
Example 4:
Bus stop, BO over-ride release command:
Device address
Char1 command
Char1 subcommand
Char2 region
Char2 object number (NPA)
Char8 override value *
Checksum
Message code:
>XX72040400YY <CR>
2.2.2 Scaling of Bus Reference and Feedback
Reference/feedback
20%
50%
100%
200%
-100%
-200%
Table 2.11: Reference/feedback values
The reference/feedback value is the percentage of the range of parameter F-52 and F-53. Values within the ranges 100% to 200% and -200% to -100% applies
only to the reference. The Float representation of the value 200% must be limited to maximum 32767 and minimum -32768.
XX
7
2
03
00
4E 00 00 00 override value = 50% speed (IEEE floating point, format)
YY
To calculate override value for speed: refer to Scaling of Network Reference
and Network Feedback. Issue an override release command through the
master to the device:
XX
7
2
04
04 (Start)
00 (Not active)
Y
If the preceding commands were issued, the drive should have accelerated
to 50% after the speed reference was issued. After the override release, the
drive should have stopped.
Scaling
20 * 16384/100
50 * 16384/100
100 * 16384/100
200 * 16384/100
-100 * 16384/100
-200 * 16384/100
Setting:
Setting:
Float
3276.8
8192
16384
32767
-16384
-32768
AF-600 FP Metasys
2
IEEX hex
454C CCCD
4600 0000
4680 0000
46FF FE00
C680 0000
C700 0000
17