Diagnostics
Document No. D106-009
Page 63 of 76
Revision 1.15
Data Alignment Errors
The Modbus request and associated mapped item is not byte aligned with the
destination Logix tag.
Illegal Function
The number of times the Modbus device responded with an Illegal Function
exception.
Illegal Data Address
The number of times the Modbus device responded with an Illegal Data Address
exception.
Illegal Data Value
The number of times the Modbus device responded with an Illegal Data Value
exception.
Slave Device Failure
The number of times the Modbus device responded with a Device Failure
exception.
Acknowledge –Response
Delay
The number of times the Modbus device responded with an Acknowledge
exception.
Slave Device Busy
The number of times the Modbus device responded with a Slave Busy exception.
Negative Acknowledge
The number of times the Modbus device responded with a Negative
Acknowledge exception.
Memory Parity Error
The number of times the Modbus device responded with a Memory Parity
exception.
Table 5.3 – Modbus statistics
The following Logix statistics are only relevant when the module is running in either Reactive
Tag or Scheduled Tag mode and the Logix controller type has been selected.
Figure 5.6. - Status monitoring – Logix Statistics