5.3 Description of Function Codes
5-278
■ Communications error processing (y02, y12)
Select an operation when an error occurs in the RS-485 communication.
The RS-485 errors are logical errors such as address error, parity error and framing error, transmission errors and
disconnection errors (the latter specified in y08 and y18). These errors occur only when the inverter is configured
to receive the operation command or frequency command via the RS-485 communication. If the operation
command or frequency command is not issued via the RS-485 communication, or when the inverter is stopped, the
system does not determine an error.
y02, y12 data Function
0
Displays the RS-485 communication error (
er8
for y02,
erp
for y12), and immediately
stops the operation (trip by alarm).
1
Operates for a period specified in the error process timer (y03, y13), and then displays the
RS-485 communication error (
er8
for y02,
erp
for y12), and stops the operation (trip by
alarm).
2
Retries the communication for a period specified in the error process timer (y03, y13), and
if the communication is recovered, the operation continues. Displays the RS-485
communication error (
er8
for y02,
erp
for y12) if the communication is not recovered,
and immediately stops the operation (trip by alarm).
3 Continues the operation if a communication error occurs.
For details, refer to the RS-485 Communication User’s Manual.
■ Error process timer (y03, y13)
Sets the error process timer, as explained above for the communications error processing parameters (y02, y12).
Refer also to the section of disconnection detection time (y08, y18).
• Data setting range: 0.0 to 60.0 (s)
■ Baud rate (y04, y14)
For inverter supporting loader (via RS-485):
The value does not need to be set since it automatically
becomes 8 bits. (It also applies to Modbus RTU.)
y05 and y15 data Function
0 8 bits
1 7 bits
■ Parity selection (y06, y16)
For inverter supporting loader (via RS-485):
The value does not need to be set since it
automatically becomes even parity.
y06 and y16 data Function
0
No parity bit
(2 bits of stop bit for Modbus RTU)
1
Even parity
(1 bit of stop bit for Modbus RTU)
2
Odd parity
(1 bit of stop bit for Modbus RTU)
3
No parity bit
(1 bits of stop bit for Modbus RTU)
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