Mitsubishi Electric 800 Series Instruction Manual page 136

 Response time
Data sending time (refer to the following formula)
Inverter data processing time
Computer
Inverter
Inverter
10 ms or more necessary
Computer
Data sending time (refer to the following formula)
[Formula for data transmission time]
1
Number of data characters *1
Communication
speed (bps)
*1 Refer to page 131.
*2 Communication specifications
Name
Stop bit length
Data length
With
Parity check
Without
In addition to the above, 1 start bit is necessary.
Minimum number of total bits: 9 bits
Maximum number of total bits: 12 bits
*3 Data check time
Item
Monitoring, operation command, frequency setting (RAM)
Parameter read/write, frequency setting (EEPROM)
Parameter clear / All parameter clear
Reset command
 Retry count setting (Pr.121)
• Set the permissible number of retries at data receive error occurrence. (Refer to
• When the data receive errors occur consecutively and the number of retries exceeds the permissible number setting, a
communication fault (E.PUE) occurs and the inverter output is shut off.
• When a data transmission error occurs while "9999" is set, the inverter does not shut off its output but outputs the Alarm
(LF) signal. To use the LF signal, set "98 (positive logic) or 198 (negative logic)" in any of Pr.190 to Pr.196 (Output
terminal function selection) to assign the function to an output terminal.
Example: PU connector communication, Pr. 121 = "1" (initial value)
Computer Inverter
Computer
Inverter
ALM
Example: PU connector communication, Pr. 121 = "9999"
Computer
Inverter
Inverter Computer
LF
ALM
Waiting time
(setting 10 ms)
Time
Communication specifications
(Total number of bits) *2
Number of bits
1 bit
2 bits
7 bits
8 bits
1 bit
0
Less than 12 ms
Less than 30 ms
Less than 5 s
No reply
Illegal
Illegal
OFF
Data check time
(depends on the
instruction code*3)
data transmission time (s)
Check time
page 134
Fault (E.PUE)
Illegal
Reception error Reception error
ON
Illegal
Reception error Reception error
ON ON
OFF
3.4 Mitsubishi inverter protocol (computer link communication)
for data receive error for retry.)
Normal
3. RS-485 Communication
1
2
3
4
5
6
7
8
9
10
135