The DP/DN signal lines may be disconnected,
or there may be no response from the slave
units. There may be a slave unit failure, or the
system configuration may have been changed
after automatic address recognition. After
narrowing down the disconnected area, using
error ID information, etc., carry out the
following:
• Check that there is no disconnection for all
transmission lines. Also check that the link
connector which is appropriate for the line
diameter is used and it is crimped with correct
pin assignment.
• Check that signal lines are correctly
connected to the terminal block. Also check
that there is no incorrect wiring or insufficient
tightening of the screws.
• When newly creating a system or alternating
the system (adding or eliminating slave units,
changing addresses), perform automatic
address recognition operation. Then, check
that the number of slave units and addresses
are the same as those of the actual system.
• If the slave unit “LINK” LED is not flashing,
check the transmission line for disconnection,
short-circuit, incorrect wiring, or contact failure
near the unit.
The slave unit detected a signal for writing a
parameter which cannot be set to itself.
After narrowing down error IDs, check that the
set value of the slave unit parameter is within
the settable range.
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