Profibus dp capacity and topology specifications – Rockwell Automation 1757-SWKIT5000 ProcessLogix R500.1 Installation and Upgrade Guide User Manual
Page 262
Publication 1757-IN500A-EN-P - September 2002
11-22 Performance and Capacity Specifications
PROFIBUS DP Capacity and Topology Specifications
The following PROFIBUS specifications are independent of the interface to
ProcessLogix:
• PROFIBUS DP supports a maximum of 126 station addresses,
including, masters, slaves and active repeaters.
• The maximum number of entries in the PBIM configuration table is
100.
Maximum number CN2FFs per 1757-PLX52
• Each Linking Device counts as 1 I/O unit in the 64 I/O units per 1757-PLX52
calculation above.
8
Not Supported
Maximum number CN2FFs per Non-Redundant Server
8
Not Supported
Maximum number CN2FFs per Redundant Server (NI-FBUS Service and NI Configurator
must be run on the Backup Server only)
48
Not Supported
Maximum number CN2FFs per NI Configurator Project
1
Not Supported
Maximum Number of H1 segments per CN2FF
2
Not Supported
Maximum number of Foundation Fieldbus Devices per H1 segment connected to a
CN2FF.
10
Not Supported
1757-FIM Related Only
50ms CEE
5ms CEE
Maximum number 1757-FIM’s per 1757-PLX52
• Each 1757-FIM counts as 3 I/O units in the 64 I/O units per 1757-PLX52
calculation above.
21
Not supported
Maximum number 1757-FIMs per Server (Redundant or Non-Redundant)
100
Not Supported
Maximum number of H1 segments per 1757-FIM
2
Not supported
Maximum number of FF Devices per H1 segments connected to a 1757-FIM.
(other constraints may be encountered before this constraint)
16
Not Supported
Configurable Values for FF function block Execution Periods. (Since 250 ms period is not
compatible with the CM’s 200 ms period, it should only be used for control if the entire
loop is resident on a Fieldbus link.)
250, 500, 1000,
2000, 4000 ms
Not Supported
Profibus Interface-Related Only
50 ms CEE
5 ms CEE
Maximum number of PFB Modules per 1757-PLX52
10
2
Maximum number of PFB Modules per downlink CNB (based on update rate, 25ms
default)
4 @ 25 ms
2 @ 12.5 ms
Not Supported
Table 11.S I/O Module Capacity