Section 7 Communication (Modbus)
7-6
Communication
(Modbus)
Error codes (Communication/Modbus)
● No response In the following cases, the received command is not processed and a
response is not returned. For this reason, a time-out occurs at the host
device.
• The client address in the received command is different from the
communication unit number set in the E5AR/ER.
• A parity error, framing error, or overrun error occurred due to a
transfer or other error.
• A CRC-16 code error occurred in the received command frame.
• An time interval greater that 3.5 characters occurred between data
sets while receiving the command frame.
End
code
Name Description
Error
detection
priority
H'01 Function code error Received an unused function code. 1
H'02
Variable address
error
The variable area number specified in the variable address is
out of range.
2
H'03 Variable data error
The number of elements does not agree with the number of
data items.
Number of elements × 2 does not agree with the byte count.
The response length exceeds the communication buffer size.
The operation code or related information in an operation
command is not correct.
The written data exceeds the setting range.
3
H'04 Operation error
The setting information in the written data is not permitted in
the current operation mode.
◆ "Write via communication" is OFF (disabled).
◆ Attempted to write to setting data of setting area 1 from set-
ting area 0.
◆ Attempted to write to protect setting data from other than
protect level.
◆ AT is r unning.
◆ User calibration in progress.
◆ Cannot process the operation command.
◆ Unit error, unit change, display unit error, internal non-vola-
tile memory error.
4
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