GE Industrial Solutions AF-600 FP Metasys - Manual (Page 18)

Example 3:
Over-ride analog output, speed (50%) change command: Setting:
Device address XX
Char1 command 7
Char1 subcommand 2
Char2 region 03
Char2 object number (NPA) 00
Char8 override value * 4E 00 00 00 override value = 50% speed (IEEE floating point, format)
Checksum YY
Message code:
>XX7203004E000000 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:
Example 4:
Bus stop, BO over-ride release command: Setting:
Device address XX
Char1 command 7
Char1 subcommand 2
Char2 region 04
Char2 object number (NPA) 04 (Start)
Char8 override value * 00 (Not active)
Checksum Y
Message code:
>XX72040400YY 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.
2.2.2 Scaling of Bus Reference and Feedback
Reference/feedback Scaling Float IEEX hex
20% 20 * 16384/100 3276.8 454C CCCD
50% 50 * 16384/100 8192 4600 0000
100% 100 * 16384/100 16384 4680 0000
200% 200 * 16384/100 32767 46FF FE00
-100% -100 * 16384/100 -16384 C680 0000
-200% -200 * 16384/100 -32768 C700 0000
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.
AF-600 FP Metasys
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