Operating instructions

7.2. E.g.: Control Word Telegram using PPO Type
This example shows how the control word telegram relates to the PLC and the frequency con-
verter, using FC Control Profile.
The control word telegram is sent from the PLC to the frequency converter. PPO Type 3 is used
in the example in order to demonstrate the full range of modules. All the values shown are arbi-
trary, and are provided for the purposes of demonstration only.
PCV PCD
1 2 3 4 5 6
PCA IND PVA CTW MRV PCD PCD PCD PCD
04 7C 20 00
PQW: 256
258 260 262 264 266 268 270 272 274
master slave→
CTW MRV
Bit no.: 15 14 13 12
11 10 9 8 76543210
0 0 0 0 0 1 0 0 0 1 1 1 1 1 0 0
0
4 7 C
The table above indicates the bits contained within the control word, and how they are presented
as process data in PPO type 3for this example.
The following table indicates which bit functions, and which corresponding bit values are active
for this example.
Bit Bit value = 0 Bit value = 1 Bit value
00 Reference value External selection lsb 0
C
01 Reference value External selection msb 0
02 DC brake Ramp 1
03 Coasting Enable 1
04 Quick stop Ramp 1
7
05 Freeze output Ramp enable 1
06 Ramp stop Start 1
07 No function Reset 0
08 No function Jog 0
4
09 Ramp 1 Ramp 2 0
10 Data not valid Valid 1
11 No function Relay 01 active 0
12 No function Relay 02 active 0
0
13 Parameter set-up Selection lsb 0
14 Parameter set-up Selection msb 0
15 No function Reversing 0
Function active
Function inactive
VLT
®
Profibus 7. Application Examples
MG.33.C4.02 - VLT
®
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