GE Industrial Solutions AF-600 FP Profibus DP - Manual (Page 24)

4.2 Process Data
Use the process data part of the PPO for controlling and monitoring the frequency converter via the PROFIBUS.
4.2.1 Process Control Data
Process data sent from the PLC to the frequency converter is defined as
Process Control Data (PCD).
Master slave
1 2 3 ...... 10
CTW MRV PCD ...... PCD
PCD write
PCD 1 contains a 16-bit control word, where each bit controls a specific function of the frequency converter, see section Control Profile. PCD 2 contains a 16-bit
speed set point in percentage format. See section Reference Handling
The content of PCD 3 to PCD 10 is programmed in par. PB-15 PCD Write Configuration and par. PB-16 PCD Read Configuration.
4.2.2 Process Status Data
Process data sent from the frequency converter contains information about
the current state of the drive.
Slave master
1 2 3 ...... 10
STW MAV PCD ...... PCD
PCD read
PCD 1 contains a 16-bit status word, where each bit contains information regarding a possible state of the frequency converter.
PCD 2 contains per default the value of the current speed of the frequency converter in percentage format (see section Reference Handling). PCD 2 can be configured
to contain other process signals.
The content of PCD 3 to PCD 10 is programmed in par. PB-16 PCD Read Configuration.
4.2.3 Reference Handling
The reference handling in the GE AF-650 GP & AF-600 FP drives is an advanced
mechanism that sums up references from different sources.
For more information on reference handling, please refer to the AF-650 GP or
AF-600 FP Design Guides.
The reference, or speed set point (MRV, send via Profibus is always transmitted to the frequency converter in percentage format as integers represented in
hexadecimal (0-4000 hex).
The reference (MRV) and feedback (MAV) are always scaled equally.
AF-650 GP/AF-600 FP Profibus DP Operating Instructions
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