Rockwell Automation 1757-SWKIT3200 ProcessLogix R320.0 Installation and Upgrade Guide - Manual (Page 254)

Publication 1757-IN032B-EN-P - April 2001
7-14 Performance and Capacity Specifications
I/O Specifications
Table 7.Q I/O Module Capacity
I/O Module and Fieldbus Capacity
50 ms CEE 5 ms CEE
Maximum Number of IOMs per 1757-PLX52
(1756/1757 + 1797 FLEX EX + 1794-FLEX I/O + CN2FFs in any
combination, exceptions noted below.) 64 12
(local 1757/1756
I/O only)
Maximum Number of Analog IOMs per 1757-PLX52
(including Pulse Input Modules) 64 12
(local 1757/1756
I/O only)
Maximum Number of Serial Interface Modules per
1757-PLX52 3 1
Maximum Number of FTA assemblies per Serial Interface
Module
•
Each FTA connected counts as 4 IOMs in the 64 Max
IOM calculation above and the 24 IOMs/1756-CNB
calculation below.
2 2
Maximum Number of Remote I/O Chassis +
1794/1797-ACNR15s (combined) per 1757-PLX52. 8 0
(local 1757/1756
I/O only)
Maximum Number of IOMs per Downlink 1756-CNB -
1756/1757 + 1797 FLEX Ex and 1794 FLEX I/O + CN2FFs in
any combination (with TC-MUX021, 1757-PIM and CN2FF
limitations as noted elsewhere)
•
Each Pulse Input Module counts as 1.5 IOMs in the
24 IOM/1756-CNB calculation (but not the 64
IOM/1757-PLX52 limit).
64 scheduled
24
unscheduled
0
(local 1757/1756
I/O only)
Maximum number of Downlink 1756-CNB’s per Controller
Chassis 4 0
Maximum number CN2FFs per 1757-PLX52
•
Each Linking Device counts as 1 IOM in the 64
IOM/1757-PLX52 calculation above.
8 0
(local 1757/1756
I/O only)
Maximum number CN2FFs per Non-Redundant Server 8 0
(local 1757/1756
I/O only)
Maximum number CN2FFs per Redundant Server (NI-FBUS
Service and NI Configurator must be run on the Backup
Server only) 16 0
(local 1757/1756
I/O only)
Maximum number CN2FFs per NI Configurator Project 1 0
(local 1757/1756
I/O only)
Maximum Number of H1 segments per CN2FF 2 N/A
Maximum number of CN2FF Devices per H1 segment
connected to a CN2FF. 10 N/A