114
5. PARAMETERS
5.7 (N) Communication operation parameters
Signal loss detection (Pr.122, Pr.336 )
• If a signal loss (communication stop) is detected between the converter unit and computer as a result of a signal loss
detection, a communication error (PU connector communication: E.PUE, RS-485 terminal communication: E.SER) occurs
and the inverter output is shut off.
• When the setting is "9999", communication check (signal loss detection) is not made.
• When the setting is "0", communication through the PU connector is not possible. The monitor items and parameter
settings can be read during communication via RS-485 terminals, but a communication error (E.SER) occurs.
• A signal loss detection is made when the setting is any of "0.1 s to 999.8 s". To make a signal loss detection, it is necessary
to send data (for details on control codes, refer to
) from the computer within the communication check time
interval. (The converter unit makes a communication check (clearing of communication check counter) regardless of the
station number setting of the data sent from the master).
Programming instructions
• When data from the computer has any error, the converter unit does not accept that data. Hence, in the user program,
always insert a retry program for data error.
• All data communication (for example, monitoring) is started when the computer gives a communication request. The
converter unit does not return any data without the computer's request. Hence, design the program so that the computer
gives a data read request for monitoring, etc. as required.
• Program example) Writing "0" in
Pr.57
Computer
Example: PU connector communication,
Pr. 121
= "1" (initial value)
Example: PU connector communication,
Pr. 121
= "9999"
Reception error
Reception error
Fault (E.PUE)
Converter unit
Computer
Converter unit
Computer
Converter unit
Computer
ENQ
ACK
NAK
NAK
LF
OFF
OFF
ENQ
ACK
NAK
NAK
ON
ON
Illegal
Illegal
ENQ
ACK
Normal
ENQ
Illegal
ENQ
Illegal
Reception error
Reception error
ALM
ON
ALM
Converter unit
Computer
Example: PU connector communication,
Pr. 122
= "0.1 to 999.8 s"
Check start
Fault (E.PUE)
Time
Converter unit
Converter unit
Computer
Communication
check counter
Pr.122
ENQ
ALM
OFF
ON
Содержание FR-CC2-N Series
Страница 61: ...60 3 PRECAUTIONS FOR USE OF THE CONVERTER UNIT 3 4 Checklist before starting operation MEMO ...
Страница 137: ...136 5 PARAMETERS 5 10 Checking parameters changed from their initial values initial value change list MEMO ...
Страница 153: ...152 6 PROTECTIVE FUNCTIONS 6 6 Check first when you have a trouble MEMO ...
Страница 165: ...164 7 PRECAUTIONS FOR MAINTENANCE AND INSPECTION 7 2 Measurement of main circuit voltages currents and powers MEMO ...
Страница 171: ...170 8 SPECIFICATIONS 8 3 Outline dimension drawings MEMO ...
