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IOL MA8 PN DI8
26
PHOENIX CONTACT
4022_en_A
The following table provides information about the fields displayed on “Modbus TCP
Diagnostics” page.
Table 5-3
“Modbus/TCP Diagnostics” page field description
Field name
Description
Active Connections
Displays the current number of active Modbus TCP connections.
Messages Received from
Masters
Displays the number of Modbus messages received from Modbus TCP Masters.
Responses Sent to Masters
Displays the number of Modbus responses sent to Modbus TCP Masters.
Broadcasts Received
Displays the number of broadcast Modbus TCP messages received.
Invalid Message Length Errors
Displays the number of Modbus messages received with incorrect length fields.
Invalid Message Data Errors
Displays the number of invalid message data errors. These errors occur when the IOL
MA8 PN DI8 receives a message that cannot be performed due to invalid data.
Invalid Message Address
Errors
Displays the number of invalid message address errors. These errors occur when the IOL
MA8 PN DI8 receives a message that cannot be performed due to an invalid address.
Unknown Device ID Errors
Displays the number of unknown device ID errors. These errors occur when the IOL MA8
PN DI8 receives a message addressed to a device ID other than the configured Slave
Mode Device ID.
Invalid Protocol Type Errors
Displays the number of invalid message protocol type errors. These errors occur when
the IOL MA8 PN DI8 receives a Modbus TCP message that specifies a non-Modbus
protocol.
Unsupported Function Code
Errors
Displays the number of invalid Modbus function code errors. These errors occur when the
IOL MA8 PN DI8 receives a message that cannot be performed due to an unsupported
Modbus function code.
Configuration Errors
Displays the number of improper configuration errors. These errors occur when the IOL
MA8 PN DI8 receives a message that cannot be performed due to an invalid
configuration.
No Available Connection
Errors
Displays the number of Modbus TCP connection attempts rejected due to no available
connections. This occurs when the number of Modbus TCP connections has reached the
limit.
System Resource Errors
Displays the number of system resource errors. These errors indicate a system error on
the IOL MA8 PN DI8, such as operating system errors or full message queues. These
errors typically occur when the PLC(s) are sending messages to the IOL MA8 PN DI8
faster than the IOL MA8 PN DI8 can process them.
First Error String
Text description of the first error that occurred.
Last Error String
Text description of the last error that occurred.
Modbus TCP Port Specific Diagnostics
Active PDO Controller(s)
Lists the controller interface(s) type (Class 1 or Class 3) and IP address controlling the
PDO data.
PDO Writes to Offline or Read-
Only Ports
Displays the number of PDO write messages dropped due to any of the following:
–
The port is configured in IO-Link mode:
–
There is no device connected to the port.
–
The IO-Link device is off line.
–
The IO-Link device does not support PDO data.
–
PDO Transmit Mode (To PLC) is disabled.
–
The port is configured in Digital Input mode.
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