INFICON PSG55x ATM to Medium Vacuum Gauge (DeviceNet) - Manual (Page 11)

tira58e1-a (2012-03) PxG5xx.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
PCG/PSG55x 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
(
→  10). Attribute 100 allows the user to configure the poll IO data assembly via
EDS even if the poll connection of the PCG/PSG55x 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 PCG/PSG55x.
Thus, definition of the PCG/PSG55x 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 PCG/PSG55x. 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