Setting Parameters; Confirmation Of Profibus Communications; Controlling The Inverter With A Plc - Siemens COMBIMASTER 411 Operating Instructions Manual

CONFIGURATION FOR S7 PLC
6.2

Setting Parameters

The following parameter settings assume that the user is starting from the default
parameter settings. If you are not starting from the default parameter settings then
use the following parameters to reset all parameters to the default settings:
P0010 = 30
P0970 = 1
The parameters that require setting are as follows:
1. Set the User Access Level using P0003 = 3. This gives the user access to
all parameters in Level 1, 2 and 3.
2. Set the PROFIBUS address using P0918. Possible settings are between 1
and 125. 0, 126 and 127 are not valid addresses (2 is normally used for the
PLC).
3. The PROFIBUS address can also be set using the Jumpers as described
in Section 5.1 on page 42. The jumper settings will take effect when the
inverter is next powered up. These settings will override the settings in
P0918.
4. Set the Command Source using P0700 = 6. This sets the Command
Source to the PROFIBUS on the Comms Link.
5. Set the Frequency Setpoint using P1000 = 6. The sets the Frequency
Setpoint to the PROFIBUS on the Comms Link.
6. On completion of steps 5 and 6 full PROFIBUS control is established.
6.3

Confirmation of PROFIBUS Communications

It is recommended that you check the correct operation of the PROFIBUS control
before it is engaged to drive a motor. The following procedure should confirm the
correct functioning of the PROFIBUS control:
1. Send the following PZD words:
047E 1000
2. Monitor the frequency setpoint (0 – 12.5 Hz) using an Operator Panel.
6.4

Controlling the Inverter with a PLC

If you have chosen PP03, you will have 2 output words (PZD1 and PZD2) from the
PLC, which correspond to the inverter control word and frequency setpoint. You will
also have two input words which are the inverter status word and actual frequency.
If you chose PPO1, the first 4 input and output words are for parameter read/write
data (PKW data). The PKW output words can be set to zero at this time. The
frequency setpoint and actual value are normalized such that 4000 hex
corresponds to 50Hz. The maximum value that should be sent is 7FFF. The
normalization frequency can be changed in P2000.
Here are some typical control and status words to get started. The status words
assume the inverter has ramped up to its frequency setpoint (where applicable).
The data sequence is: control word — frequency setpoint — status word — actual
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PROFIBUS Communication Module
Issue 03/02
Operating instructions
6SE6400-5AV00-0BP0