SEW-Eurodrive DHR41B, Manual

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Manual – MOVI-PLC® advanced DHR41B for EtherNet/IP, Modbus/TCP and PROFINET IO
8
Connection management
The Modbus Protocol (Modbus/TCP)
8.3.2 Dropping connections
A connection is deleted from the internal connection list if
• The 'keep alive' time has elapsed and the server no longer receives a response, or
• The socket reports a fault
• The connection to the client has been dropped
If it was a controlling connection, another controlling connection can be established.
If there are no permitted PO data sent within the timeout interval, a fieldbus timeout
is triggered.
The default keep-alive time is 10 seconds. If there is a controlling connection with the
timeout interval > 5 s, the keep-alive time is increased to 2
×
timeout interval.
In the event of a cable break or a socket fault of a controlling connection, the fieldbus
timeout in the unit will be displayed once the timeout interval has elapsed. Then a new
controlling connection can be established.
8.3.3 Timeout monitoring
The timeout monitoring time can be set in the range of 0 to 650 s in steps of 10 ms.
• 0 s and 650 s means: Timeout monitoring is deactivated
• 10 ms - 649.09 s means: Timeout monitoring is activated
The timeout interval can be set via:
• Register object 219E
hex
(8606
dec
)
• Parameter access to index 8606 via register object 200
hex
203
hex
• Parameters in the parameter tree of MOVITOOLS
®
MotionStudio
The timeout monitoring is triggered when a controlling connection is activated. The field-
bus driver cyclically checks whether the last PO data update was received within the tim-
eout interval.
If the timeout monitoring is deactivated by setting the timeout interval to 0 or 65000, no
fieldbus timeout is detected. This also applies when the controlling connection is
dropped.
In the event of a timeout, the timeout response is executed as programmed in the IEC
program.
A change to the timeout interval (writing on index 8606) is activated after a re-boot.
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