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Manual – MOVI-PLC® advanced DHR41B for EtherNet/IP, Modbus/TCP and PROFINET IO
37
6
Introduction
The Ethernet Industrial Protocol (EtherNet/IP)
6
The Ethernet Industrial Protocol (EtherNet/IP)
6.1
Introduction
The EtherNet Industrial Protocol (EtherNet/IP) is an open communication standard
based on the classic EtherNet protocols TCP/IP and UDP/IP.
EtherNet/IP has been defined by the
O
pen
D
eviceNet
V
endor
A
ssociation (ODVA) and
C
ontrolNet
I
nternational (CI).
EtherNet/IP extends EtherNet technology to include the CIP application protocol (
C
om-
mon
I
ndustrial
P
rotocol). CIP is known in the field of automation engineering because it
is also used for DeviceNet and ControlNet as an application protocol.
6.2
Process data exchange
Up to 64 process data words can be exchanged with an EtherNet/IP master (scanner)
depending on the use of the DHR41B unit. The EtherNet/IP master (scanner) sets the
process data length when opening the connection.
In addition to a controlling 'Exclusive Owner Connection', up to two 'Listen Only Connec-
tions' are available. This means the actual values of the drive can also be read out by
stand-by controllers or visualization devices.
If one controlling connection is already active via Modbus/TCP, an 'Exclusive Owner
Connection' cannot be activated via EtherNet/IP without a power-on reset.
Timeout behavior
The timeout status is triggered by the DHR41B option. The timeout interval must be set
by the EtherNet/IP master (scanner) when the connection is established. The Ether-
Net/IP specification refers to a 'Requested Packet Interval (RPI)' instead of a timeout in-
terval.
The timeout interval displayed in the MOVITOOLS
®
MotionStudio parameter tree re-
sults from the Requested Packet Interval (RPI) multiplied with the 'Timeout Multiplier'.
This timeout interval is retained in the device when an 'Exclusive Owner Connection' is
removed, and the device switches to timeout status after the timeout interval has
elapsed. The timeout status is displayed on the front of the DHR41B option by the flash-
ing red L13 LED.
A you can only activate the timeout delay via the bus, you must not change the value via
MOVITOOLS
®
MotionStudio.
The timeout state causes the response programmed in the IEC program.
The timeout state can be reset via EtherNet/IP as follows:
• Via the reset service of the identity object (class 0x01, instance 0x01, undetermined
attribute)
• By re-establishing the connection
• Via the reset bit in the control word
0
0
I
Содержание DHR41B
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