ICC ETH-1000, Инструкция по эксплуатации, Страница: 218 / 281

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ICC
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EtherNet/IP client Data Table Read, Data Table Write, Typed Read, and
Typed Write services can use the slot number to target the (Logix, PLC5,
SLC5/05) controller in (slot 0) of the rack.
•
EtherNet/IP client also supports Produced Tag connections to cyclically
access data on a -Logix PLC.
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The class 1 and class 3 connections operate independently of each other.
This applies to both the server and client drivers.
•
EtherNet/IP client only supports multicast in the T
→
O direction.
•
EtherNet/IP server class 1 implicit I/O supports both multicast and point-to-
point (unicast) when producing data in the T
→
O direction.
•
If an EtherNet/IP server class 1 point-to-point connection is established in
the (T
→
O) direction, no more EtherNet/IP server class 1 connections can be
established.
•
If a class 1 connection’s consuming half (O
→
T) times out, then the
producing half (T
→
O) will also time-out and will stop producing.
•
If a class 1 or class 3 connection timeout occurs, the driver will trigger a
timeout event as described in section 8.3. For EtherNet/IP client, class 3
connections timeout after 30 seconds. Class 1 timeout values are calculated
by multiplying the
RPI and Multiplier .
•
For class 1 client connections, if the API (actual packet interval) returned by
the server is within
±
10ms of the client’s configured RPI setting, then the
connection is successful. This
±
10ms restriction is enforced in order to notify
the user (by way of an unsuccessful connection) that the server’s data rate
capabilities “substantially” differ from the configured client settings. The
connections will produce and consume data according to the
API .
11.7.2 EtherNet/IP Client
The EtherNet/IP client supports both explicit and I/O messaging and can
communicate with both EtherNet/IP server and CSP (PCCC) server devices.
The following explicit messaging commands are supported:
•
Get Attribute Single – Returns the contents of the specified attribute.
•
Set Attribute Single – Modifies the contents of the specified attribute.
•
Data Table Read – Reads data associated with the tag name.
•
Data Table Write – Writes data associated with the tag name.
•
Typed Read – Reads a block of data from the file number and offset.
•
Typed Write – Writes a block of data to the file number and offset.
11.7.2.1 EtherNet/IP Client Service Objects
The EtherNet/IP client protocol uses service objects to describe what services
the gateway should perform. If the service object is configured for a class 1