Table 5-1 Modbus Rtu Data Layer Status Exception Codes - Honeywell HC900 User Manual

Table 5-1 Modbus RTU Data Layer Status Exception Codes

Exception
Code
01 Illegal Function
02 Illegal Data Address
03 Illegal Data Value
04 Slave Device Failure
06 Slave Device Busy
07 NAK,
Negative Acknowledge
Revision 13
April 2017
Definition
The message received is not an allowable action for the
addressed device.
The address referenced in the function-dependent data
section of the message is not valid in the addressed
device.
The value referenced at the addressed device location
is not within range.
The addressed device has not been able to process a
valid message due to a bad device state.
The addressed device has rejected a message due to a
busy state. Retry later.
The addressed device cannot process the current
message. Issue a PROGRAM POLL to obtain device-
dependent error data.
HC900 Process Controller Communications User Guide
Modbus RTU Exception Codes
Introduction
Description
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