Retry Count Setting; Data Transmission Error - Mitsubishi Electric FR-A700 Instruction Manual

Parameter
Retry count setting (Pr. 121, Pr. 335)
Set the permissible number of retries at occurrence of a data receive error. (Refer to page 6-453
for data receive error for retry.)
When data receive errors occur consecutively and exceed the permissible number of retries set,
an inverter alarm (E.PUE) is provided and the output is shut off.
When "9999" is set, an inverter alarm is not provided even if data receive error occurs but a minor
fault output signal (LF) is output. For the terminal used for the LF signal output, assign the func-
tion by setting "98 (source logic) or 198 (sink logic)" in any of Pr. 190 to Pr. 196 "Output terminal
function selection".
Example PU connector communication with different settings of paramter 121
Computer
⇓ Data flow
Inverter
Inverter
⇓ Data flow
Computer
Computer
⇓ Data flow
Inverter
Inverter
⇓ Data flow
Computer
Fig. 6-225: Data transmission error
FR-A700 EC
PU connector communication, Pr. 121 = 1 (initial value)
PU
Wrong
Reception error
PU connector communication, Pr. 121 = 9999
Wrong
Reception error
OFF
Communication operation and setting
Alarm E.PUE
Wrong
Reception error
Alarm E.PUE
Wrong Normal
Reception error
ON OFF
I001354E
6 - 455