Siemens SIRIUS M200D Manual page 20

Product family
2.4 Internal design
Addressing the M200D AS-i STANDARD motor starter
Slave 1 and Slave 2 occupy two AS-i addresses, such as 1A and 2A or 1A and 1B.
In this way, A/B technology can be used to control up to 31 M200D AS-i STANDARD motor
starters in a single AS-i segment.
● If only A addresses are assigned, the cycle time is a maximum of 5 ms.
● If both A and B addresses are assigned, the cycle time is a maximum of 10 ms.
Assigning data to the slave
The cyclic process image PII/PIO is distributed among both slaves (slave 1 and slave 2).
Slave 1 data exchange
Cyclic process image
Acyclic data sets
Extended process image
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For explanatory information, please refer to Process data and process image (Page 120)
Explanation of terms
Diagnostics via parameter channel (parameter echo)
The "Write Parameter" AS-i command is used to transfer 4 parameter bits to the slave. In the
response frame, the slave returns 4 bits (16 bit combinations) of status information.
Process image
Every time the slave is called, 4 bits of control data (PIO) are transferred to the slave on the
M200D AS-i STANDARD motor starter. The slave responds with 6 bits of information (PII) in
the slave response. The bits are transferred at least every 10 ms (AS-i cycle), depending on
what addresses have been assigned.
Note
In the AS-i system, these bits are also referred to as binary data.
CTT2 transfer (Combined Transaction Type 2)
Serial data transfer is set up between the AS-i master and slave (Clock In/Out, Data In/Out).
This channel is used to transfer the data sets and extended process image. For an
explanation, see Extended cyclic process image via CTT2 (Page 123).
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Slave 2 data exchange
Cyclic process image
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Parameter echo (read out diagnostics via
parameter channel)
M200D AS-Interface Standard
Manual, 08/2014, A5E02548958A/RS-AA/004