Example: Simple Control Word, Reference, Status Word And Main Actual Value - Danfoss MCA 123 POWERLINK Operating Instructions Manual

Application Examples

8.2 Example: Simple Control Word, Reference, Status Word and Main Actual Value

This example shows how the control word telegram relates
to the controller and the frequency converter, using FC
Control Profile.
The control word telegram is sent from the PLC to the
frequency converter. Standard Telegram 1 is used in the
0
CTW
04 7C
256
PQW:
CTW
31 30
Bit no.:
0 0
Table 8.3 Standard Telegram 1 Example
Table 8.3 indicates the bits contained within the control
word, and how they are presented as process data in
Standard Telegram 1 for this example.
8 8
Bit
00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
Function active
Function inactive
Table 8.4 Bit Functions
44
PCD
1 2 3
MRV PCD PCD
20 00
258
260 262
MRV
29 28 27 26 25 24 23 22
0 0 0 1 0 0 0 1
0 4
Bit value=0
Reference value
Reference value
DC brake
Coasting
Quick stop
Freeze output
Ramp stop
No function
No function
Ramp 1
Data not valid
No function
No function
Parameter set-up
Parameter set-up
No function
MG92C102 - VLT
MCA 123 POWERLINK Operating Instructions
example to demonstrate the full range of modules. All the
values shown are arbitrary, and are provided for
demonstration purposes only.
21 20 19 18 17 16 15 14
1 1 1 1 0 0 0 0
7 C
Table 8.4 indicates which bit functions, and which
corresponding bit values are active for this example.
Bit value=1
External selection lsb
External selection msb
Ramp
Enable
Ramp
Ramp enable
Start
Reset
Jog
Ramp 2
Valid
Relay 01 active
Relay 02 active
Selection lsb
Selection msb
Reversing
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13 12 11 10 9 8 7 6
1 0 0 0 0 0 0 0
2 0 0
Bit value
0
0
C
1
1
1
1
7
1
0
0
0
4
1
0
0
0
0
0
0
5 4 3 2 1 0
0 0 0 0 0 0
0