RSTi-OM User Manual
Section 9
GFK-3212A
Jun 2021
PROFINET IO Reference Information
99
The following table provides information about the Modbus/TCP Diagnostics page.
Modbus/TCP Diagnostics
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 broadcasts 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 IO-Link Master 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 IO-Link Master 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 IO-Link Master receives a message
that is 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 IO-Link Master
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 IO-Link Master
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 IO-Link Master receives a
message that cannot be performed due to an invalid
configuration.
No Available Connection Errors
Displays the number of Modbus/TCP connection
attempts that were 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 IO-Link such as
operating system errors or full message queues. These
errors typically occur when the PLC(s) are sending
messages to the IO-Link Master faster than the IO-Link
Master 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 IP addresses that are controlling the PDO data.
PDO Writes to Offline or Read-
Only Ports
Displays the number of PDO write messages that were
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 offline.
The IO-Link device does not support PDO data.
The PDO Transmit Mode (To PLC) is disabled.
The port is configured in Digital Input mode.
ISDU Request Msgs From
PLC(s)
Displays the number of ISDU request messages received
from the PLC(s) or other controllers. These request
messages may contain one or multiple ISDU commands.
ISDU Invalid Requests
Displays the number of ISDU requests received over
Modbus/TCP with one or more invalid commands.
