30
Models FL3100H/3101H
3. An exception code is returned when the FL3100H / FL3101H receives the query
without a communications error, but cannot process it due to reading or writing to a
non-existent or illegal Function Code, Illegal Command Starting Address or Register
Address, or Illegal Data Value. The exception response message has two fields that
differentiate it from a normal response. See the next section for more information.
5.5.1 Exception
Responses
Byte
Modbus
Range
Referenced to FL3100H /
FL3101H
1
st
Slave Address
1-247* (Decimal) FL3100H / FL3101H ID (Address)
2
nd
Function Code
83 or 86 (Hex)
MSB is set with Function Code
3
rd
Exception Code 01 - 06 (Hex)
Appropriate Exception Code (See
below)
4
th
CRC Lo
00-FF (Hex)
CRC Lo Byte
5
th
CRC Hi
00-FF (Hex)
CRC Hi Byte
Table 17: Exception responses
5.5.1.1 Exception Code Field
In a normal response, the FL3100H / FL3101H returns data and status in the data field,
requested in the query from the master. In an exception response, the FL3100H / FL3101H
returns an exception code in the data field, which describes the condition that caused the
exception. Below is a list of exception codes that are supported by the FL3100H / FL3101H:
Code
Name
Description
01
Illegal Function
The function code received in the query is not an
allowable action for the FL3100H / FL3101H.
02
Illegal Data Address
The data address received in the query is not an
allowable address for the FL3100H / FL3101H.
03
Illegal Data Value
A value contained in the query data field is not an
allowable value for the FL3100H / FL3101H.
04
Slave Device Failure
An unrecoverable error occurred while the
FL3100H / FL3101H was attempting to perform the
requested action.
05
Acknowledge
The FL3100H / FL3101H has accepted the request
and is processing it, but a long duration of time will
be required. This response is returned to prevent a
timeout error from occurring in the master.
06
Device Busy
The FL3100H / FL3101H is engaged in processing
a long-duration program command. The master
should retransmit the message later when the slave
is free.
Table 18: Exception Code Field
Summary of Contents for FL3101H
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