Rockwell Automation 1757-SWKIT4000 ProcessLogix R400.0 Installation and Upgrade Guide - Manual (Page 273)

Publication 1757-IN040B-EN-P - March 2002
Performance and Capacity Specifications 11-21
PROFIBUS DP 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.
ProcessLogix/PROFIBUS Interface Topology Specifications
•
The SST-PFBCLX module is not a redundancy compliant device
and therefore cannot be introduced into a controller rack of a
redundant controller configuration. However in non-redundant
applications, the module can be deployed in either the
controller rack or a downlink I/O chassis.
•
The PBIM block can support a maximum of 100 unique
modules, identified by a unique station/module number
combination.
•
The PBIM block imposes the following constraints, which may
affect the number of slave stations/devices supported:
– The sum of all input message sizes from all input devices
cannot exceed 496 bytes.
– The sum of all output message sizes from all output devices
cannot exceed 492 bytes.
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 CPM 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.N I/O Module Capacity
The following applies to the Phase 2 Fieldbus integration using the 1757-FIM with controlled support
for Phase 1 Fieldbus interface using the CN2FF.