Mitsubishi Electric FR-A700 Series, Техническое руководство

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PARAMETER
2.21.5 Mitsubishi inverter protocol (computer link communication)
(common
)
You can perform parameter setting, monitor, etc. from the PU connector or RS-485 terminals of the inverter using the
Mitsubishi inverter protocol (computer link communication).
(1) Communication specifications
(2) Communication procedure
common
Item Description
Related
Parameter
Communication protocol Mitsubishi protocol (computer link) [ Pr. 551 ]
Conforming standard EIA-485 (RS-485) —
Number of connectable devices 1: N (maximum 32 units), setting is 0 to 31 stations
[ Pr. 117 ]
[ Pr. 331 ]
Communication
speed PU connector Selectable from among 4800/9600/19200 and 38400bps [ Pr. 118 ]
RS-485 terminals Selectable from 300, 600, 1200, 2400, 4800, 9600, 19200 and 38400bps [ Pr. 332 ]
Control procedure Asynchronous —
Communication method Half-duplex —
Communication
specifications
Character system ASCII (7 bits or 8 bits can be selected)
[ Pr. 119 ]
[ Pr. 333 ]
Start bit 1bit —
Stop bit length 1 bit or 2 bits can be selected
[ Pr. 119 ]
[ Pr. 333 ]
Parity check Check (even, odd) or no check can be selected
[ Pr. 120 ]
[ Pr. 334 ]
Error check Sum code check —
Terminator CR/LF (presence/absence selectable)
[ Pr. 124 ]
[ Pr. 341 ]
Waiting time setting Selectable between presence and absence
[ Pr. 123 ]
[ Pr. 337 ]
Data communication between the computer and
inverter is made in the following procedure.
*1 If a data error is detected and a retry must be made,
execute retry operation with the user program. The
inverter comes to an alarm stop if the number of
consecutive retries exceeds the parameter setting.
*2 On receipt of a data error occurrence, the inverter
returns retry data 3) to the computer again. The inverter
comes to trip if the number of consecutive data errors
reaches or exceeds the parameter setting.
1) Request data is sent from the computer to
the inverter. (The inverter will not send data
unless requested.)
2) After waiting for the waiting time
3) The inverter sends return data to the
computer in response to the computer
request.
4) After waiting for the inverter data processing
time
5) Answer from the computer in response to
reply data 3) of the inverter is transmitted.
(Even if 5) is not sent, subsequent
communication is made properly.)
When data is read
When data is written
1) 5) 4)
3) 2)
*1
*2
Computer
(Data flow)
Inverter
Computer
(Data flow)
Inverter
Time