Omron SYSDRIVE 3G3RV, User Manual

Page: 305 / 446

Communications Functions
6-
89
n
Error Codes
The
following table shows RS-422A/485 communications error codes.
n
Slave Not Responding
In
the following cases, the slave will ignore the write function. If the slave address specified in the command
message
is 0, all slaves execute the write function, but do not return response messages to the master.
•
When
a communications error (overrun, framing, parity, or CRC-16) is detected in the command message.
• When
the slave address in the command message and the slave address in the Inverter do not agree.
•
When
the data that configures the message and the data time length exceeds 24 bits.
•
When
the command message data length is invalid.
Application Precautions
Set
a timer in the master to monitor response time from the slaves. Make the setting so that if no response is
sent
to the master from the slave within the set time, the same command message is sent again from the mas-
ter.
Error Code Contents
01H
Function
code error
A
function code other than 03H, 08H, or 10H has been set by the PLC.
02H
Invalid
register number error
• The
register address you are attempting to access is not recorded anywhere.
• With
broadcast sending, a start address other than 0000H, 0001H, or 0002H has been set.
03H
Invalid
quantity error
• The
Quantity (number of data item) in the command message must be in range between 1 to 16.
• In
the write command message, the Numbers of attached data bytes must be twice of the Quantity.
21H
Data
setting error
• A
simple upper limit or lower limit error has occurred in the control data or when writing parame-
ters.
• When
writing parameters, the parameter setting is invalid.
22H
Write
mode error
• Attempting
to write parameters during operation.
• Attempting
to write an ENTER command during operation.
• Attempting
to write parameters other than A1-00 to A1-05, E1-03, or 02-04 when warning alarm
CPF03
(defective EEPROM) has occurred.
• Attempting
to write read-only data.
23H
Writing
during main circuit undervoltage (UV) error
• Writing
parameters from the PLC during UV (main circuit undervoltage) alarm.
• Writing
ENTER commands from the PLC during UV (main circuit undervoltage) alarm.
24H
Writing
error during parameters processing
Attempting
to write parameters from the PLC while processing parameters in the Inverter.