INFICON SKY CDGxxxD (DeviceNet) - Manual (Page 33)

tira51e1 (2009-01) CDGxxxD.cp
33
Master MAC ID: 0
Allocation choice: Explicit, poll, bit strobe, COS
Slave address: 2
⇒ Allocation string: 416 00 4B 03 01 57 00
Slave’s explicit/unconnected response message: 413 00 CB 00
Within the first allocation message the explicit connection has to be
established.
After the allocation, the device activates an INACTIVITY WATCHDOG TIMER.
This timer has to be set for every single connection (connection object, attribute 9)
which is allocated in the allocation choice byte. This attribute defaults to 2500
(2500 milliseconds) within explicit messaging connections, and to zero within an I/O
connection. If the INACTIVITY WATCHDOG TIMER expires, the established
connection will be released. With every message the device receives, this timer is
reloaded with the value specified in the according connection object and so it
doesn’t expire. The value zero deactivates the INACTIVITY WATCHDOG TIMER.
So in this step the inactivity watchdog timer has to be set. In testing mode you
could use the value 0 to deactivate the inactivity watchdog timer.
In the following you see the strings for setting the EPR attribute (addresses as
specified above):
ID Message body
414 00 10 05 01 09 00 00 set EPR of the explicit connection to zero
414 00 10 05 02 09 00 00 set EPR of the poll connection to zero
414 00 10 05 03 09 00 00 set EPR of the bit strobe connection to zero
414 00 10 05 04 09 00 00 set EPR of the COS/cyclic connection to zero
The responses of the slave are:
ID Message body
413 00 90 00 00 set EPR of the explicit connection to zero
You can specify which of the several in a device predefined input/output assem-
blies should be used for every single connection.
Reading or setting of the input/output assemblies is possible only if the
corresponding connection (polling, change of state, bit strobe) has been
allocated in the allocation message.
If you want to read the number of the chosen assembly, you must read the attrib-
utes 14 and 16 in the corresponding Instance of the connection object (object ID 5).
For reading this value, the connection has to be established. The EPR attribute
may be set.
Instance 2: Polling
Instance 3: Bit strobe
Instance 4: Change of state/cyclic
Example
Setting of the EPR attribute
(expected packet rate)
Choice of the input and output
assemblies
Reading the configured
assemblies