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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.
MSC1
input/output data
diagnosis
parameters
configuration
SetSlaveAddress
MSAC1 SAPs
PDU
MSAC2 SAPs
PDU
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.
2. Maximally 8 modules can be configurated
3. The maximum length is limited to 42 bytes if the I+M service is off.
4. The maximum length is limited to 52 bytes if the I+M service is off.
Subject to reasonable modifications due to technical advances.
Pepperl+Fuchs Group · Tel.: Germany (6 21) 7 76-0 · USA (3 30) 4 25 35 55 · Singapore 7 79 90 91 · Internet http://www.pepperl-fuchs.com
Restrictions due to the SPC3
double master: 272 bytes
62 bytes
double master: 88 bytes
2
32 bytes
4 bytes
1
3
72 bytes
2
4
72 bytes
AS-i/PROFIBUS Gateway
PROFIBUS DP
1
Copyright Pepperl+Fuchs, Printed in Germany
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