Process Data; Process Control Data; Process Status Data - Danfoss VLT PROFIBUS DP MCA 101 Programming Manual

Control
Standard telegram
1
Danfoss telegram
4 4
PPO 1
PPO 2
PPO 3
PPO 4
PPO 6
PPO 7
PPO 8
Illustration 4.1 Available PPO Types

4.2 Process Data

Use the process data part of the PPO to control and
monitor the frequency converter via the PROFIBUS.

4.2.1 Process Control Data

Process control data (PCD) is the process data sent from
the PLC to the frequency converter.
Master/follower
1
CTW
Table 4.1 Process Control Data
PCD 1 contains a 16-bit control word, and each bit controls
a specific function of the frequency converter, see
chapter 4.3 Control Profile.
PCD 2 contains a 16-bit speed setpoint in percentage
format. See chapter 4.2.3 Reference Handling.
14
Programming Guide
CTW/STW REF/MAV
PCV CTW/STW REF/MAV
PCV CTW/STW REF/MAV
CTW/STW REF/MAV
PCV CTW/STW REF/MAV
CTW/STW REF/MAV
CTW/STW REF/MAV
CTW/STW REF/MAV
2 3 .......
MRV PCD .......
PCD write
Danfoss A/S © Rev. 05/2014 All rights reserved.
(The old PPO type 3)
PCD 2 PCD 3
Read/
Read/
Write
Write
PCD 2 PCD 3 PCD 4
Read/
Read/ Read/
Write Write Write
PCD 2 PCD 3 PCD 4
Read/ Read/ Read/
Write Write Write
PCD 2 PCD 3 PCD 4
Read/ Read/ Read/
Write Write Write
PCD 2 PCD 3 PCD 4
Read/ Read/ Read/
Write Write Write
The content of PCD 3 to PCD 10 is determined by the
settings in parameter 9-15 PCD Write Configuration and
parameter 9-16 PCD Read Configuration.

4.2.2 Process Status Data

Process status data is the process data sent from the
frequency converter, and contains information about the
current state.
Follower master
10
1
PCD
STW
Table 4.2 Process Status Data
PCD 1 contains a 16-bit status word, and 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
chapter 4.2.3 Reference Handling). PCD 2 can be configured
to contain other process signals.
PCD 5
Read/
Write
PCD 5
Read/
Write
PCD 5 PCD 6 PCD 7
Read/ Read/ Read/
Write Write
Write
PCD 5 PCD 6 PCD 7 PCD 8
Read/ Read/ Read/
Read/
Write
Write Write Write
2 3 ......
MAV PCD ......
PCD read
PCD 9
Read/
Write
10
PCD
MG37G102