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Communication via CC-Link
4.4
Setpoint handling
Regulation of
With SIMOVERT MASTERDRIVES converters there are several
frequency or torque
possibilities to control a drive. In systems with CC-Link the drive can be
controlled by frequency setpoints or torque setpoints.
In the following sections there is the description how to handle the CBL
for controlling the drive with frequency setpoints. It is also valid for
torque control. Different handling is specially noted.
For more information about the possibilities of controlling and regulating
refer to converter documentation.
Handling setpoints
Giving setpoints from the PLC is possible in two ways:
♦ Working with fixed setpoints selected by control bits RL, RM and
♦ Working with variable setpoints. They will be set with the frequency
In the converter you can select (softwiring) one of the different sources
by the parameter P443 Source main setpoint. Refer to documentation
of converter; function diagram 316.
At regulation of torque use P486; refer to documentation of converter;
function diagram 320.
Example:
1) working with fixed setpoints RL, RM, RH:
2) working with variable setpoints by frequency set command:
The different data formats for handling setpoints will be discribed in
chapter 4.9, "Data formats and data conversion".
The drive is started by activating control bit STF (RYn0: forward) or
STR (RYn1: reverse).
4-6
RH. The fixed setpoints are stored in the fixed setpoint buffer of the
converter. They can parameterized from the panel of the converter
(PMU) or from PLC via CC-Link.
set command .
=> P443 = 0040
Set frequency value from fixed setpoint
buffer.
=> P443 = 3002
Set frequency value from first CBL to
Source main setpoint.
Operating Instructions
6SE7087-6NX84-0GB0
Siemens AG
SIMOVERT MASTERDRIVES
03.99
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