Mitsubishi Electric FR-A800, Instruction Manual

Page: 821 / 1042

Parameters (N) Operation via communication and its settings
FR-A800 5 - 641
Error detection of message data
The following errors are detected in message data from the master. The inverter is not tripped even
if an error is detected.
Modbus register
●
System environmental variables
Communication parameter settings are not cleared.
At a write, the data is set as the control input command.
At a read, the data is read as the inverter running status.
At a write, the data is set as the operation mode setting.
At a read, the data is read as the operation mode setting.
Error item Error description Inverter operation
Parity error
The data received by the inverter is different from
the specified parity (Pr. 334 setting).
When this error occurs, Pr. 343 is
incremented by one.
When this error occurs, the LF signal is
output.
Framing error
The data received by the inverter is different from
the stop bit length (Pr. 334) setting.
Overrun error
The next data has been sent by the master before
the inverter completes receiving the preceding
data.
Message frame error
The data length of the message frame is checked,
and an error is generated if the received data
length is less than 4 bytes.
CRC check error
An error is generated if the data in the message
frame does not match the calculation result.
Tab. 5-292: Error check items
NOTE The LF signal can be assigned to an output terminal by setting Pr. 190 to Pr. 196 (output terminal
function selection). Changing the terminal assignment may affect other functions. Set parameters
after confirming the function of each terminal.
Register Definition Read/Write Remarks
40002 Inverter reset Write Any value can be written
40003 Parameter clear Write Set H965A for the write value.
40004 All parameter clear Write Set H99AA for the write value.
40006
Parameter clear
Write Set H5A96 for the write value.
40007
All parameter clear
Write Set HAA99 for the write value.
40009
Inverter status/control input command
Read/Write Refer to the following.
40010
Operation mode/inverter setting
Read/Write Refer to the following.
40014 Running frequency (RAM value) Read/Write
The display can be changed to the rotations
per minute using Pr. 37, Pr. 144 and Pr. 811.
(Refer to page 5-324.)
40015 Running frequency (EEPROM value) Write
Tab. 5-293: System environment variable