Burkert Type 8640 - Manual (Page 59)

59
Configurationandparameter
settingsforDeviceNet
12. CONFIGURATION AND PARAMETER
SETTINGS FOR DEVICENET
12.1. Configuration of process data
To transmit process data via an I/O connection, there is one static input and one static output assembly available.
These assemblies contain selected attributes combined into one object so that process data can be transmitted
collectively via an I/O connection.
The process data can be accessed either cyclically in the connection variants 'polled I/O' and 'bitstrobed I/O' with
'change of state' when the input values vary, or acyclically via Explicit Messages. The access path for acyclical
access is:
class 4
instance 1
attribute 3
The output data can be read in acyclically via the Get_Attribute-Single service or written to acyclically via the
Set_Attribute_Single service.
4 data bytes for inputs (sensors or initiators)
3 data bytes for outputs (actuators or valves)
12.2. Configuration of the safety position of solenoid
valves if bus error
If a bus error occurs, the bus status LED may assume the "Green flashing", "Red flashing" or "Red" status.
(For a description see "Status of the Bus Status LED")
The objects Fault Action and Fault Value can be used to configure the solenoid valves in the event of a bus error.
If a bus fault occurs, the configuration data of the solenoid valves can be accessed acyclically via Explicit
Messages.
The service Get_Attribute_Single is available for read access to the configuration data and the service
Set_Attribute_Single is available for write access to the configuration data.
Object Fault Action (class 9 / instance 1-3 / attribute 5):
Determines the reaction of the outputs when a bus error occurs. Here, each output byte has an instance assigned
to it (in groups of 8 in each case).
Description
1
bin
On error the output retains its current state.
0
bin
On error the output is switched to the state laid down in the object Fault Value at the appro-
priate position.
Object Fault Value (class 9 / instance 1-3 / attribute 6):
Determines the state of the outputs when a bus error occurs. Prerequisite: Appropriate setting in Object Fault
Action. Here, each output byte has an instance assigned to it (in groups of 8 in each case).
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