9.2 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
example to demonstrate the full range of modules. All the
values shown are arbitrary, and are provided for
demonstration purposes only.
PCD
0
1
2
3
CTW
MRV
PCD
PCD
04
7C
20
00
PQW:
256
258
260
262
CTW
MRV
Bit no.:
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0
0
0
0
0
1
0
0
0
1
1
1
1
1
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
4
7
C
2
0
0
0
Table 9.3 Standard Telegram 1 Example
indicates the bits contained within the control
word, and how they are presented as process data in
Standard Telegram 1 for this example.
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
Table 9.4 Bit Functions
Application Examples
MCA 124 EtherCAT Operating Instruction
44
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