Lenze EMF2112IB - Manual (Page 11)

Technical data
3-3 BA2112EN
3.6 Communication data
3.6.1 Processing time of the controller
The INTERBUS transfer time or cycle time is added to the processing time in the controller.
The processing time of the controller depends on the controller series and type. The cycle time of
the bus system is independent of the processing time of the controller.
Processing time 820X
For the 820X series several processing steps are required. These steps are processed cyclically.
A processing cycle consists of:
•
Writing the control word or setpoint, if the value has changed
•
Alternating reading of status word and actual value
If the time tolerances caused by cyclic reading of the status word/actual value are too large, the
alternating reading of the status word and the actual value can be suppressed. This is controlled by
the bit 15 (PE inhibit) of the DRIVECOM control word:
•
PE inhibit = 0: Status and actual-value update active
•
PE inhibit = 1: Status and actual-value update inactive
In the following table you will find a list of the processing times:
Processing step Max. processing time in ms Processing tolerance in ms
Setpoint
Control word
35 8
Actual value
35 -8
Status word
Setpoint + control word 70 -16
Setpoint + control word +
actual value + status word 140 -32
Note:
A change of the setpoint signal results in writing the control word.
Processing time 821X / 8200 vector / 822X
•
Process data: approx. 3 ms + 2 ms tolerance
Processing time 93XX
•
Process data: approx. 3 ms + 2 ms tolerance
3.6.2 Number of participants
•
The maximum number of participants in the INTERBUS-Loop is 63.
Tip!
The maximum number of participants is not always possible. The number of fieldbus modules
(participants) taking part in the communication is limited by the sum of their partial currents.
The sum current limit is I
max
= 1.8 A.
Example
The INTERBUS-Loop is loaded with approx. 50 mA per controller connected.
Here the sum current of I
max
= 1.8 A is reached when 36 controllers are connected.
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