PROFIBUS DP Communication
‑152‑
Figure 7‑8 Example PKW data sent by the master when modifying an AC drive parameter
PKW data exchange with the AC drive is performed cyclically. Continuous write
command (PKE = 0x20xx) on the EEPROM will significantly shorten the service life of
the AC drive's main control chip. Therefore, to modify AC drive parameters, you are
advised to perform aperiodic write operations (see SFB53 described in "
7.7.4
Performing Aperiodic Read/Write Operations on the AC Drive Slave
"
on page 173
"
7.7.4
Performing Aperiodic Read/Write Operations on the AC Drive Slave
"
on page 173
" "
on
page
) or write to RAM addresses in PKW. The following table lists the RAM addresses
of the parameters.
Parameter Group
Address
F0 to FF 0x00 to 0x0F
A0 to AF 0x40 to 0x4F
For example, the RAM address of F0‑10 is 0x000A.
PZD Data
The PZD data enables the master to modify and read AC drive data in real time and
perform periodic data exchange. The data communication addresses are directly
configured by the AC drive. The functions of PZD data are as follows:
● Setting the AC drive control command and target frequency in real time
● Reading the current state and running frequency of the AC drive in real time
● Exchanging function parameter and monitoring parameter data between the AC
drive and PROFIBUS master in real time The PZD is used for periodic data
exchange between the master and the AC drive, as described in the following
table.
Master Transmit Data PZD
AC Drive Command
AC Drive Target Frequency
AC Drive Parameters
Modified in Real Time
PZD1 PZD2 PZD3 to PZD12
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