Mitsubishi Electric FR-A700 Technical Manual page 409

[RS-485 terminal communication related parameter]
[Pr.] Name
RS-485 communication station
331
number
332 RS-485 communication speed
RS-485 communication stop bit
333
*2
length
RS-485 communication parity
334
check selection
RS-485 communication retry
335
*3
count
RS-485 communication check
336 *3
time interval
RS-485 communication waiting
337
*3
time setting
RS-485 communication CR/LF
341
*3
selection
549 Protocol selection
*1 When [ ] (Modbus-RTU protocol) is set, the setting range within parenthesis is applied.
Pr. 549 = 1
*2 For the Modbus-RTU protocol, the data length is fixed to 8 bits and the stop bit depends on the [
page 459)
*3 The Modbus-RTU protocol becomes invalid.
*4 The Modbus-RTU protocol of
*5 If communication is made with [Pr. 336 RS-485 communication check time interval = 0] (initial value), monitor, parameter read,
etc. can be performed, but the inverter results in an alarm as soon as it is switched to the NET operation mode. If the
operation mode at power-ON is the Network operation mode, a communication alarm (E.SER) occurs after first
communication.
When performing operation or parameter write through communication, set [Pr. 336 = 9999] or larger value. (The setting
depends on the computer side program.)
2.21.4 Communication EEPROM write selection [Pr. 342]
When parameter write is performed from the inverter PU
connector, RS-485 terminals, USB communication
communication option, parameters can be written to the
RAM.
When changing the parameter values frequently, set [Pr.
342 = 1] to write them to the RAM.
[Pr.] Name
342 Communication EEPROM write selection
The above parameters can be set whenever the communication option is connected.
A700 F700
Initial Value Setting Range
0
0 to 31 (0 to 247)
3, 6, 12, 24,
96
48, 96, 192, 384
1 0, 1, 10, 11
2 0, 1, 2
1 0 to 10, 9999
0s
0.1 to 999.8s
9999
9999 0 to 150ms, 9999
1 0, 1, 2
0
is only valid for the communication from the RS-485 terminals.
A700 F700
( Refer to page 449)
and
Initial Value
0
443
Set the inverter station number.
*1
(same specifications as [Pr. 117] )
select the communication speed.
(same specifications as [Pr. 118] )
Select stop bit length and data length.
(same specifications as [Pr. 119] )
Select the parity check specifications.
(same specifications as [Pr. 120] )
Set the permissible number of retries at occurrence of
a data receive error. (same specifications as [Pr. 121] )
RS-485 communication is enabled. However, the
0 inverter will come to trip if operation is changed to
NET operation mode.
Set the interval of communication check time.
(same specifications as [Pr. 122] )
No communication check
Set the waiting time between data transmission to the
inverter and response. (same specifications as [Pr.
123] )
Select presence/absence of CR/LF. (same
specifications as [Pr. 124])
0 Mitsubishi inverter (computer link operation) protocol
1 Modbus-RTU protocol
common
(common
The life of the EEPROM will be shorter if parameter write is
performed frequently with [Pr. 342 = 0] (initial value)
(EEPROM, RAM write).
When [Pr. 342 = 1] (write to RAM only), powering OFF the
inverter will erase the changed parameter values.
Therefore, the parameter values available when power is
switched ON again are the values stored in EEPROM
previously.
Setting Range
Parameter values written by communication
0
are written to the EEPROM and RAM.
Parameter values written by communication
1
are written to the RAM.
PARAMETER
Description
*5
*4
] setting. (Refer to
Pr. 334
)
Description
2