Diagnostics
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The Modbus tab displays the following parameters:
Statistic
Description
Tx Packet Count
The number of Modbus packets sent by the module.
Rx Packet Count
The number of Modbus packets received by the module.
Checksum errors
The number of corrupted Modbus packets received by the module.
Parity errors
The number of bytes with parity errors received by the module.
Timeout Errors
The number of message response timeouts the module has encountered.
Data Too Large
The number of Modbus requests or responses where the data was too large to
process.
Map Item Not Found
The number of Modbus requests did not match any mapped items.
Node Mismatch
The received Modbus req
uest did not match the module’s Modbus node address.
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 7.9 - Modbus Statistics Tab