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Error
code
Error message Possible error reason
occur if the slave device does not reply in time or does
not reply at all. A wrong unit address will also cause
this error. On some occasions this exception is also
produced if the characters received do not constitute a
complete frame.
133 Send time-out Signals that fieldbus data sent a timed out. This can
only occur if the handshake lines are not properly set.
Error
code
Error message Possible error reason
160 MODBUS
®
exception
response
Signals that a MODBUS exception response was
received. Exception responses are sent by a slave
device instead of a normal response message if it
received the query message correctly but cannot
handle the query. This error usually occurs if a master
queried an invalid or non-existing data address or if
the master used a MODBUS function, which is not
supported by the slave device.
161 Illegal Function exception
response
Signals that an Illegal Function exception response
(code 01) was received. It is sent by a slave device
instead of a normal response message if a master sent
a MODBUS function, which is not supported by the
slave device.
162 Illegal Data Address
exception response
Signals that an Illegal Data Address exception
response (code 02) was received. It is sent by a slave
device instead of a normal response message if a
master queried an invalid or non-existing data
address.
163 Illegal Data Value exception
response
Signals that a Illegal Value exception response was
(code 03) received. It is sent by a slave device instead
of a normal response message if a master sent a data
value which is not an allowable value for the slave
device.
164 Slave Device Failure
exception response
Signals that a Slave Device Failure exception response
(code 04) was received. It is sent by a slave device
instead of a normal response message if an
unrecoverable error occurred while processing the
requested action. This response is also sent if the
request would generate a response whose size exceeds
the allowable data size.
Maestro Software Manual Ethernet/IP Communication
MAN-MASSW (Ver. Q)
12-20
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