INFICON SKY CDGxxxD (DeviceNet) - Manual (Page 11)

tira51e1 (2009-01) CDGxxxD.cp
11
4 Object Structure
Class Code 05
h
= 05
d
The connection class allocates and manages the internal resources associated
with both I/O and explicit messaging connections. The specific instance generated
by the connection class is referred to as a connection instance or a connection
object.
The following Instances of the connection object are supported:
• Instance 1: Explicit messaging
• Instance 2: I/O polling
• Instance 4: I/O change of state/cyclic I/O connection
Please refer to the DeviceNet specification for further information.
For the selection of the active input assembly the following vendor specific attribute
can be used.
Vendor specific extension:
Attribute
ID
Access
rule
NV/
V
Name DeviceNet
Data type
Description of attribute Semantics
100 Get/Set NV Poll produce
assembly
instance
USINT Contains the instance num-
ber of the assembly used by
this connection to send data 1, 2 (default), 3, 4, 5, 6,
8, 9, 10, 11, 12, 13, 14
This vendor-specific attribute facilitates the configuration of the data assembly, the
temperature controlled CDGxxxD will send to the DeviceNet master as poll
response. It offers the possibility to select a (predefined) data assembly via a
configuration tool + EDS file (
→ [6]). Attribute 100 allows the user to configure
the poll IO data assembly via EDS even if the poll connection of the temperature
controlled CDGxxxD is in the established state. The assembly number is stored
non volatile. Modifications of the poll produce assembly instance will take effect
only after a reset of the temperature controlled CDGxxxD.
Thus, definition of the temperature controlled CDGxxxD data assembly can be
done in various ways:
1) Standard method (without using attribute 100):
The DeviceNet master configures the "Produced Connection Path" attribute of
the poll connection (connection instance 2) when establishing communication to
the temperature controlled CDGxxxD. This requires a master to support
expanded explicit messaging capabilities.
2) Directly setting attribute 100 e.g. by a configuration tool
(e.g. RS networks) + device reset
4.1 Connection Object
4.1.1 Vendor-Specific Object
Extension on Instance 2
Poll Connection