Inovance MD520 Series - Protocol Description

PROFIBUS DP Communication
‑149‑
Cable Parameter
Type A Type B
Impedance
135 Ω to 165 Ω (f = 3 to 20 MHz) 100 Ω to 130 Ω (f > 100 kHz)
Capacitor < 30 pF/m < 60 pF/m
Resistor
< 110 Ω/km
Not specified
Cross‑sectional area
of conductor
≥ 0.34 mm
2
≥ 0.22 mm
2
7.5 Protocol Description
Data Transmission Formats
In the PROFIdrive protocol, the PPO is used as the data transmission format. PPOs are
classified into PPO1, PPO2, PPO3, PPO4, and PPO5, all of which are supported by the
MD38DP2 expansion card.
The following table lists the functions supported by each data format.
Data Format
Supported Functions
PPO1
Operation on a single function parameter
Setting of AC drive command and frequency
Reading of AC drive state and running frequency
PPO2
Operation on a single function parameter
Setting of AC drive command and frequency
Reading of AC drive state and running frequency
Periodic writing of four function parameters
Periodic reading of four function parameters
PPO3
Setting of AC drive command and frequency
Reading of AC drive state and running frequency
PPO4
Setting of AC drive command and frequency
Reading of AC drive state and running frequency
Periodic writing of four function parameters
Periodic reading of four function parameters
PPO5
Operation on a single function parameter
Setting of AC drive command and frequency
Reading of AC drive state and running frequency
Periodic writing of ten function parameters
Periodic reading of ten function parameters
Data blocks of the PPO data are divided into two areas, PKW area (parameter value)
and PZD area (process data). The following figure shows the PPO data formats
supported by MD38DP2.