PROFIBUS DP Communication
‑176‑
Note that before running an organization block, you need to download data blocks
(above the function block, DB1 and DB2 in this example) to the PLC. Otherwise, an
error indicating that the DB blocks are not loaded will be reported.
SFB53 is used to perform operations on the EEPROM. Therefore, the program is
required to invoke relevant operations when required and disable relevant operations
in time. As shown in the following figure, after the write operation is complete (M1.1 is
set to 1), the program is invoked to reset M1.0.
When SFB52 and SFB53 are executed, relevant blocks need to be invoked for multiple
times. Therefore, do not invoke them when single execution is required.
7.8 Fault Diagnosis
7.8.1 Troubleshooting
The following table describes the faults that may occur during use of the MD38DP2
expansion card and the AC drive.
Symptom
Solution
After the AC drive is powered on,
only the power indicator (D4) is
on, indicating that communication
between the MD38DP2 expansion
card and the AC drive is not
established.
1. Check that F0‑28 is set to 1.
2. Check the AC drive type. This user guide only
describes the usage of MD520. For other AC drive
models, contact the technical engineers to obtain the
correct user guide.
After the AC drive is powered on,
the power indicator (D4) is on and
the indicator of communication
with the AC drive (D2) blinks.
Set the station number correctly (within the range of
1 to 125). Note that digit 8 of the DIP switch is the
least significant bit of the address.
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