INFICON BCG450-SD ATM to Ultra-High Vacuum Triple Gauge (DeviceNet) - Manual (Page 8)

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tira40e1 (2005-04) BCG450SDv1.cp
2 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
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
Requirement in
Implementation
Access
Rule
NV/
V
Name DeviceNet
Data Type
Description of Attribute Semantics
100 Optional 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, 4, 5, 8, 9, 10, 12, 13
This vendor-specific attribute facilitates the configuration of the data assembly, sent
by the BCG450-SD to the DeviceNet Master as Poll response. It offers the possibi-
lity to select a (predefined) data assembly via a configuration tool + EDS file
(
→ [1]). Attribute 100 allows the user to configure the Poll I/O Data Assembly
via EDS even when the Poll Connection of the BCG450-SD 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 BCG450-SD.
Thus, definition of the BCG450-SD data assembly can be done in two ways:
1) Standard methode (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 BCG450-SD. This requires a master to support expanded explicit mes-
saging capabilities.
2) Directly setting Attribute 100 e.g. by a configuration tool
(e.g. RS Networks) + Device Reset.
2.1 Connection Object
2.1.1 Vendor-Specific Object
Extension on Instance 2
Poll Connection