Bus parameters Setting range (default
setting)
Meaning and limiting values
T1
Inter Sequence
Timer
-
(480 000
corresponds to
approximately 15 s)
The parameter T1 specifies the number of clock cycles that an interface module
(or an LAS) waits for a response from an FF device.
If the set number of clock cycles is exceeded, the service for this FF device will
terminate with an error message.
T2
Set Addr
Sequence Timer
T2 >= T3 + 3*T1 (host)
(2880000
corresponds to
approximately 90 s)
The parameter T2 specifies the number of clock cycles that is available to an
FF device for actions and data transfer. Any unperformed actions and data
transmissions are cancelled.
FF devices newly connected to the FF segment can only be detected if the value
T2 is sufficiently dimensioned.
T3
Set Addr Wait
Timer
-
(1 440 000
corresponds to
approximately 45 s)
Parameter T3 corresponds to a waiting time (number of clock cycles).
On expiration of this waiting time the interface module (or LAS) checks the FF
devices that are recognized as new on the FF.
"Node Polling" area
Bus parameters Setting range (default
setting)
Meaning and limiting values
First Unpolled
Node
20 < FUN < 232 FirstUnpolledNodeId (FUN)
(Default setting in SIMATIC STEP 7 / PCS 7: FUN = 36)
This parameter specifies the first device address that is not processed (not
polled) by the LAS.
Number of
Consecutive
Unpolled Node
NUN = 232 - FUN
NumConsecUnpolledNodeId (NUN)
(Default setting: NUN = 232 - 36 = 196)
Range of consecutive device addresses not in the polled range.
In SIMATIC STEP 7 / PCS 7 (Unpolled Bereich):
Default setting of 36 - 231
"Other bus parameters" area
Select the checkbox to set the parameters:
● Checkbox "Automatic calculation"
The bus parameters are automatically set on the basis of the current configuration.
● Checkbox "Manual entry"
You can change the following parameters for each specific system.
Engineering
4.3 Parameter assignment
FOUNDATION Fieldbus
36 Commissioning Manual, 03/2013, A5E03880935-02
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