Step 7 Program Example For Cyclic Communication - Siemens SIMATIC ET 200pro Series Operating Instructions Manual

Appendix
A.1 STEP 7 program examples
A.1.2

STEP 7 program example for cyclic communication

Table A- 2
HEX
E
7
246
Assignment of the control bits in the inverter to the SIMATIC flags and inputs
BIN Bit in Significance
STW1
0 0 ON/OFF1
1 1 OFF2
1 2 OFF3
1 3 Operation enable
1 4 Ramp-function generator enable
1 5 Start ramp-function generator
1 6 Setpoint enable
0 7 Acknowledge fault
The controller and inverter communicate via
standard telegram 1. The control specifies con-
trol word 1 (STW1) and the speed setpoint, while
the inverter responds with status word 1 (ZSW1)
and its actual speed.
In this example, inputs E0.0 and E0.6 are linked
to the ON/OFF1 bit or to the "acknowledge fault"
bit of STW 1.
Control word 1 contains the numerical value
047E hex. The bits of control word 1 are listed in
the following table.
The hexadecimal numeric value 2500 specifies
the setpoint frequency of the inverter. The maxi-
mum frequency is the hexadecimal value 4000.
The controller cyclically writes the process data
to logical address 256 of the inverter. The invert-
er also writes its process data to logical ad-
dress 256. You define the address area in HW
Config.
Bit in
MW1
8
9
10
11
12
13
14
15
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257324B AE
Bit in Bit in Inputs
MB1 MB2
0 E0.0
1
2
3
4
5
6
7 E0.6
SIMATIC ET 200pro FC-2 converter