Yaskawa MotionWorks IEC Hardware - Manual (Page 61)

MotionWorks IEC Hardware Configuration – 2013-03-26 58
since the MODBUS protocol is unaware of the
significance of any particular value of any
particular register.
04 Slave Device
Failure An unrecoverable error occurred while the
server (or slave) was attempting to perform
the requested action.
05 Acknowledge Specialized use in conjunction with
programming commands. The server (or
slave) has accepted the request and is
processing it, but a long duration of time will
be required to do so. This response is
returned to prevent a timeout error from
occurring in the client (or master). The client
or master) can next issue a Poll Program
Complete message to determine if processing
is completed.
06 Slave Device
Busy Specialized use in conjunction with
programming commands. The server (or
slave) is engaged in processing a long–
duration program command. The client (or
master) should re transmit the message later
when the server (or slave) is free.
08 Memory
Parity Error Specialized use in conjunction with function
codes 20 and 21 and reference type 6, to
indicate that the extended file area failed to
pass a consistency check. The server (or
slave) attempted to read record file, but