Mitsubishi Electric MELIPM Series Instruction Manual page 74

4) Sumcheck
As a sumcheck value, set the lower 1 byte (8 bits) of the sum derived from
ASCII data (station number, instruction code, waiting time, data code)
except the control code. The communication data is converted into ASCII
automatically.
Data
Binary code
ASCII code
Sumcheck value calculation: H30+31+45+31+31+30+37+41+44=H1F4
5) Error codes
When the data received by the drive unit is in error, the error code is
returned to the computer. The definitions of the error codes are as follows.
Error Code Error Item
Computer
H0
NAK error
H1 Parity error
Sumcheck
H2
error
Protocol
H3
error
Framing
H4
error
H5 Overrun
Character
H7
error
HA Mode error
Instruction
HB
code error
Data range
HC
error
Station Instruction
ENQ
Number Code
0 1 E
(H05) H30 H31 H45 H31
Error Definition
The number of errors
consecutively detected in
communication request data from
the computer is greater than the
permissible number of retries.
The parity check result does not
match the specified parity.
The sumcheck value in the
computer does not match that of
the data received by the drive
unit.
Data received by the drive unit is
in the wrong protocol, data
receive is not completed within
the given time, or CR and LF are
not as set in the parameter.
The stop bit length differs from the
initial setting.
New data has been sent by the
computer before the drive unit
completes receiving the preceding
data.
The character received is invalid
(other than 0 to 9, A to F, control
code).
Parameter write was attempted in
other than the computer link
operation mode or during drive
unit operation, for example.
The specified command does not
exist.
Invalid data has been specified for
parameter write, running speed
write, etc.
8-20
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8 PARAMETER FUNCTIONS
Waiting
Data Code
Time
1 1 0 7 A
H31 H30 H37 H41 H44 (H46 H34)
Drive Unit Operation
If errors occur
consecutively more
than the permissible
number of
communication retries
(Pr. 121 setting), the
drive unit displays
E. PUE and comes to
an alarm stop.
Refer to: Chapter 6,
The receive data is
made invalid and the
drive unit continues
operation.
Sumcheck
D F 4
6.1.1
Protective
function
activated