Inovance MD520 Series - Page 101

PROFINET Communication
‑100‑
Symptom
Solution
After the
connec
tion is
success
ful, all
indica
tors on
the PLC
are
green,
but data
cannot
be
written
into or
read
from the
AC drive.
No data can be
written/read.
Check whether the operated address is correct. For example,
if the I address and Q address of the station are both 520 to
531 (note that the I and Q addresses may start from different
numbers), the PZD1 and PZD2 data written into the AC drive
are stored in QW520 and QW522, respectively. (If the PLC is
S7‑300 or S7‑400, PQW is required.) If SFC15 is used, check
whether RET_VAL of the SFC15 block is 0. If not, an
invocation error exists. Eliminate this error first and invoke
the block again.
PZD3 or
subsequent
data can be
written, but
PZD1 or PZD2
cannot be
written/read.
Check that F0‑02 is set to 2 and F0‑03 is set to 9. Check
whether the command reference is in the range of 1 to 7 (not
bit) or frequency reference is in the range of –F0‑10 to +F0‑10.
If not, the write operation fails. Check whether FE‑00 is set to
U3‑17 and FE‑01 is set to U3‑16. If not, manually correct the
parameter values or restore to factory settings.
PZD1 and PZD2
can be written/
read, while
PZD3 or
subsequent
data cannot be
written/read.
Check whether the PZD is supported by the message type.
Check whether Device-specific parameters are set correctly
(check whether the mapping is correct by checking
corresponding parameters in group FE).
‑
Check the logic relations. Check whether the same PZD is
assigned with values for multiple times in a certain logic
relation (check whether the value given by the PLC is correct
under the logic relation in the monitoring table of the PLC).
After communication is
established, the AC drive
reports ERR164, which
cannot be cleared.
However, the D1 indicator
on the PN card and the BF
indicator on the PLC are
normal.
Check whether the high‑order 8 bits of the PZD1 data (QW
data) written into the AC drive are 0 in the PLC program. If
not, change them to 0. The PZD1 command in this user guide
refers to values instead of bits. Note that this solution applies
to MD520 only. For other AC drives, consult the technical
personnel.
When the status word returned by the MD500‑PN1 card and the AC drive during communi‑
cation cannot show the fault state, you need to monitor the state by using OB82, or write a
changed value to an address of the AC drive and read it back to check the state.