Mitsubishi Electric F700 Instruction Manual page 174

(5) Response time
Data sending time (Refer to the following formula)
Computer
Inverter
Inverter
Computer
[Formula for data sending time]
1
×
Communication
speed (bps)
Communication specifications
Name
Stop bit length
Data length
Parity check
In addition to the above, 1 start bit is necessary.
Minimum number of total bits. 9 bits
Miximum number of total bits. 12 bits
(6) Open cable detection (Pr. 122, Pr. 336 RS-485 communication check time interval)
⋅ If disconnection (communication stop) is detected between the inverter and computer as a result of disconnection
check, a communication error (PU connector communication: E.PUE, RS-485 terminal communication: E.SER)
occurs and the inverter output is shut off.
⋅ Disconnection check is made when the setting is any of "0.1s" to "999.8s". To make disconnection check, it is
necessary to send data (control code refer to page 165) from the computer within the communication check time
interval. (The send data has nothing to do with the station number)
⋅ Communication check is started at the first communication in the operation mode having the operation source
(PU operation mode for PU connector communication in the default setting or network operation mode for RS-
485 terminal communication).
⋅ When the setting is "9999", communication check (disconnection detection) is not made.
⋅ When the setting is "0", communication from the PU connector cannot be performed. For communication via the
RS-485 terminals, monitor, parameter read, etc. can be peformed, but a communication error (E.SER) occurs as
soon as the inverter is switched to network operation mode.
Example: PU connector communication, Pr. 122 = "0.1 to 999.8s"
Operation Mode
Computer
Inverter
Inverter
Computer
Pr.122
Communication
check counter
Inverter data processing time
10ms or more necessary
Data sending time (Refer to the following formula)
Number of data Communication specifications
×
characters (total number of bits) = Data send time (s)
(Refer to page 164) (See below.)
Number of
Bits
1 bit
2 bits
7 bits
8 bits
Yes 1 bit
No 0
External
PU
Check start
Communication operation and setting
Waiting time Data check time
(setting 10ms) (depends on the
instruction code (see the
following table))
Time
Data check time
Item
Various monitors, run command,
frequency setting (RAM)
Parameter read/write, frequency
setting (EEPROM)
Parameter clear/all clear
Reset command
Alarm(E.PUE)
Check Time
12ms
30ms
5ms
No answer
3
Time
167