09.02 Start-Up
Siemens AG 6SE7087-6AK85-1AA0
4-61
Rectifier/Regenerating Unit Operating Instructions
4.5.3 Sequence of operations for starting up CAN bus boards (CBC):
1 With the power supply switched off, insert the board with adapter board (ADB) into the slot. For
installation details see Section 9.1, Options for integration into the electronics box.
2 The following are important communication parameters:
P696 Basic identifier for PKW request/PKW response
P697 Basic identifier for PZD receive
P698 Basic identifier for PZD transmit
P699 No. of the PZD for PZD transmit
P700 Refreshment rate for PZD transmit
P701 Basic identifier for PZD receive broadcast
P702 Basic identifier for PZD receive multicast
P703 Basic identifier for PZD receive lateral communication
P704 Basic identifier for PKW request broadcast
P705 Baud rate, when P706.002 = 0:
0=10kBit/s, 1=20kBit/s, 2=50kBit/s, 3=100kBit/s, 4=125kBit/s, 5=250kBit/s, 6=500kBit/s,
7=reserved, 8=1MBit/s
P706.01 0 = functionality corresponding to layer 2 of the ISO OSI 7-layer model (CANopen is not
supported by the SIMOVERT 6SE70 rectifier/regenerative feedback unit
P706.02 Bus timing (this should not be changed)
P695 Telegram failure time (0 = deactivated)
P918 Bus address (node ID)
P053, P927 Parameterization enable (need only be set if parameter values are to be altered via the
CAN bus)
P090 or P091 Logging the board
The connections for the process data on the communications board are made using the corresponding
source and target parameters (see Section 4.3). For the meaning of bits in the control words and the
status words, see Section 4.3.
3 Switching off and on of the electronics supply voltage. Doing this causes the values of parameters P696
to P706 and P918 to be transferred from the supplementary board.
The CAN (
Controller Area Network) fieldbus is being used increasingly for industrial applications in spite of its
limited network length (max. 40 m with a data transmission rate of 1 Mbaud).
Data are transferred by means of telegrams. Each data message, the so-called
COBs (Communication
Objects), has its own individual identifier and contains a maximum of 8 bytes of user data. The CBC board
uses the Standard Message Format with
11-bit identifier. Simultaneous use by other nodes of Extended
Message Format with 29-bit identifiers is tolerated, but messages with this format are not evaluated.
Nodes on the bus determine from the identifier which telegrams apply to them. The COBs to be sent and
received by each node must be defined before data transmission commences.
The identifiers also determine bus accessing priority. Low identifiers gain faster access to the bus, i.e. they have
higher priority then high identifiers.
Errored telegrams can be reliably detected by means of a number of interactive error detection mechanisms. A
transmission is automatically repeated when errors are detected.
The figure below shows a diagram of the CAN architecture model that is oriented toward the ISO-OSI-7 layer
reference model. The CBC supports the functionalities provided by layers 2 and 7 of this model.
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