Functions
5.11 Operation in fieldbus systems
Frequency inverter
Operating Instructions, 08.10. 2008, t.b.d.
191
Figure 5-36 Evaluating the status of G120 via PROFIBUS or PROFINET
Information about the S7 program
The hexadecimal numeric value 047E is written to control word 1. The bits in control word 1
are listed in the following table.
Table 5- 69 Assignment of the control bits in the frequency converter to the SIMATIC flags and inputs
HEX BIN Bit in
STW1
Meaning
Bit in
MW1
Bit in
MB1
Bit in
MB2
Inputs
0
0
ON/OFF1
8
0
E0.0
1
1
ON/OFF2
9
1
1
2
ON/OFF3
10
2
E
1
3
Operation enable
11
3
1
4
Ramp-function generator enable
12
4
1
5
Start ramp-function generator
13
5
1
6
Setpoint enable
14
6
7
0
7
Acknowledge fault
15
7
E0.6
0
8
Jog 1
0
0
0
9
Jog 2
1
1
1
10
PLC control
2
2
4
0
11
Setpoint inversion
3
3
0
12
Irrelevant
4
4
0
13
Motorized potentiometer ↑
5
5
0
14
Motorized potentiometer ↓
6
6
0
0
15
Data set changeover
7
7
In this example, inputs E0.0 and E0.6 are linked to the -bit ON/OFF1 or to the "acknowledge
fault" bit of STW 1.
The hexadecimal numeric value 2500 specifies the setpoint frequency of the frequency
converter. The maximum frequency is the hexadecimal value 4000.
The process data is written to logical address 256 of the frequency converter in the cyclic
time slice of S7 (e.g. OB1) and read from logical address 256 of the frequency converter.
The logical addresses for field bus communication were defined in HW Config.