Inovance MD520 Series - Page 180

PROFIBUS DP Communication
‑179‑
Symptom
Solution
After communication is
established, the communication is
normal when the AC drive is not
running. However, when one or
more AC drives are running, the
AC drive is disconnected
randomly.
1. Disconnect the power supply, and measure the
resistance between A1 and B1 of the PROFIBUS DP
slave interface at the farthest end with a multimeter.
The resistance should be 100±20 Ω.
2. Check that the shield layers of cables are
connected together and the shield layers are in
contact with the sheet metal in the PROFIBUS DP
interface. The shield layers are not required to
connect with other GND.
After the connection is
established, if the AC drive reports
a fault, the faulty slave cannot
connect to the network when the
PLC configuration is changed and
downloaded or when only the AC
drive is powered on again.
MD38DP2 only supports the interruption mode DPV0.
If the interruption mode is set to DPV1, when a slave
is faulty, the PLC master may close the PROFIBUS DP
connection channel of the slave or interrupt all the
PLC communication (which usually occurs on S7‑
1200). When such a symptom occurs, change the
PROFIBUS DP interruption mode (which is DPV0 by
default in STEP 7 and DPV1 by default in PORTAL) of
the slave to DPV0 under General DP parameters.
Then, compile and download the configuration, and
power on the PLC again.
Indicator Status and Troubleshooting
Indicator※
Status
Symptom
Solution
Red (D4)
OFF
The MD38DP2
expansion card is not
powered on.
Check that connection
between the MD38DP2
expansion card and the AC
drive is secure.
Green (D2)
OFF
The connection
between the MD38DP2
expansion card and the
AC drive fails.
Check that F0‑28 is set to 1
and the connection
between the MD38DP2
expansion card and the AC
drive is secure.
Green (D2)
Blinking at 1 Hz
The connection
between the MD38DP2
expansion card and the
AC drive fails.
Check that the PROFIBUS
DP station number is
within the range of 1 to
125.
Yellow (D3)
Blinking at 1 Hz
A configuration error
occurs.
Check that the GSD file is
correct.
Yellow (D3)
Blinking at 2 Hz
A parameter error
occurs.
Check that all parameter
addresses in Device-
specific parameters are
supported by the AC drive.