Rockwell Automation 1757-SWKIT3200 ProcessLogix R320.0 Installation and Upgrade Guide - Manual (Page 258)

Publication 1757-IN032B-EN-P - April 2001
7-18 Performance and Capacity Specifications
Table 7.W 1757-PLX52 Memory Resources and Block Configuration
1757-PLX52 Memory Resources and Block Configuration
Definition: MU = Memory Unit = 1 Kbyte = 1024 bytes
Maximum Available 1757-PLX52 Memory Resources 4000 MU
Maximum Total Number of CMs, SCMs and IOMs Configurable
per 1757-PLX52 1000
Maximum Number of Component Blocks per CM 40
Maximum Total Number of Steps and Transitions
(in all handlers) per SCM 160
(80 Step/Transition pairs)
Table 7.X Typical IOM/CM/SCM Processing and Memory Resource Requirements
Typical IOM/CM/SCM Processing and Memory Resource Requirements
Total Processing Resources (PU/sec) per module are computed as = Processing Resource
Consumption (PU/module execution) / Execution Period (sec/module execution).
Typical Module Types
(FB Content in Parenthesis) Processing Resource Consumption
(Per Module) Memory
Resource
Usage
See Notes
50/5 ms CEE
Non-Redundant
(PU/Module
Execution) 50 ms CEE
Redundant
(PU/Module
Execution) 50/5 ms CEE
(MU/Mod)
Typical I/O Module
(Average consumption of available IOMs) 0.3 0.19 0.6
Analog Digital Acquisition Module
(10 AI, 10 DataAcq FBs) 2.9 3.8 7.4
Small Analog Data Acquisition Module
(1 AI, 1 DataAcq FB) 0.47 0.43 1.0
Regulatory Control Module
(1 AI, 1 DataAcq, 1 PID, 1 AO, 6 Logic FBs) 2.8 2.8 3.9
Auxiliary Function Module
(10 Aux. FBs, such as AuxCalc, Totalizer) 4.2 5.1 13.1
Digital Data Acquisition Module
(10 DI, 10 Flag FBs) 1.2 1.2 3.1
Small Digital Data Acquisition Module
(1 DI, 1 Flag FBs) 0.22 0.14 0.6
Device Control Module
(2 DI, 2 DO, 1 DevCtl, 5 Logic FBs) 1.3 1.3 3.1
Logic Control Module
(20 Logic FBs) 1.0 1.0 3.5
Sequence Control Module
(1) 2.0 3.0 55