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PROFIBUS DP
Subject to reasonable modifications due to technical advances.
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Is
s
ue dat
e -
12.
8.
2007
61
9.3
Restrictions
The SPC3 has only 1,5 KByte DP-RAM available. Therefore the lengths of telegrams
and the numbers of DP V1-connections to class 2 masters have to be restricted.
I+M service
contains data for identification and maintenance. This service is
on
by default. Switching the services off provides additional memory into
SPC3. This changes the DPVD length-limit.
Restrictions due to the SPC3
MSC1
input/output data
double master: 272 bytes
1
1. The maximum length of the input and output data can vary up to 272 bytes input or output data if the
I+M
(informa-
tion+maintenance)
service
is
on
only. The maximum length of the input and output data (both master) is not variable
and it is limited to 144 bytes (for input and output data) if the
I+M service
is disabled.
diagnosis
62 bytes
parameters
double master: 88 bytes
configuration
2
2. Maximally 8 modules can be configurated
32 bytes
SetSlaveAddress
4 bytes
MSAC1 SAPs
PDU
1
72 bytes
3
3. The maximum length is limited to 42 bytes if the
I+M service
is
off
.
MSAC2 SAPs
PDU
2
72 bytes
4
4. The maximum length is limited to 52 bytes if the
I+M service
is
off
.