Yaskawa MotionWorks IEC Hardware - Manual (Page 59)

MotionWorks IEC Hardware Configuration – 2013-03-26 56
Figure 7: Modbus status WORD
Modbus errors in the lower byte of the status variable ONLY if the
Application Error bit is TRUE.
Modbus Exception Codes
Code (In
lower
byte of
the
status
variable) Name Meaning
01 Illegal
Function The function code received in the query is not
an allowable action for the server (or slave).
This may be because the function code is
only applicable to newer devices, and was not
implemented in the unit selected. It could
also indicate that the server (or slave) is in
the wrong state to process a request of this