SEW MOVIDRIVE MDX60B, User Manual

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Manual – MOVIDRIVE® MDX60B/61B Communication and Fieldbus Unit Profile
4
MOVILINK® protocol via RS485 transmission method
Serial Interfaces of MOVIDRIVE® B
4.3.4 Structure and length of user data
PDU type (TYPE) The TYPE byte describes the structure and length of subsequent user data (protocol
data unit (PDU)). The figure below shows the structure of the TYPE byte.
Besides, bit 7 of the TYPE byte indicates whether the user data are transmitted cyclically
or acyclically. A request telegram with cyclic transmission method signals the inverter
that the data sent by the master is updated cyclically. Consequently, response monitor-
ing can be triggered in the inverter. This means if the inverter does not receive a new
cyclic request telegram within a timeout time, which can be set, a timeout response will
be triggered.
The following tables show the PDU types for cyclic and acyclic transmission. The
telegram length depends on the PDU type used and is calculated as follows:
Telegram length = PDU 4.
Transmission
methods The following tables show the PDU types for ACYCLIC and CYCLIC transmission
methods.
The standard PDU types consist of the MOVILINK
®
parameter channel and a process
data channel. For the coding of the parameter channel and process data, refer to
chapter "SEW unit profile".
01492BEN
...Idle... SD1 ADR TYP PDU BCC
Bit: 7 6 5 4 3 2 1 0
PDU type
reserved
transmission variant
0: cyclical
1: acyclical
TYPE byte PDU name Description PDU length
in bytes Telegram
length in bytes
Cyclic Acyclic
00
hex
0
dec
80
hex
128
dec
PARAM + 1PD
8 byte parameter c
1 process data word
10 14
01
hex
1
dec
81
hex
129
dec
1PD 1 process word 2 6
02
hex
2
dec
82
hex
130
dec
PARAM + 2PD
8 byte parameter c
2 process data words
12 16
03
hex
3
dec
83
hex
131
dec
2PD 2 process data words 4 8
04
hex
4
dec
84
hex
132
dec
PARAM + 3PD
8 byte parameter c
3 process data words
14 18
05
hex
5
dec
85
hex
133
dec
3PD 3 process data words 6 10
06
hex
6
dec
86
hex
134
dec
PARAM + 0PD
8 byte parameter channel
without process data
8 12