Rockwell Automation 1757-SWKIT5000 ProcessLogix R500.1 Installation and Upgrade Guide - Manual (Page 258)

Publication 1757-IN500A-EN-P - September 2002
11-18 Performance and Capacity Specifications
1757-PLX52 Resources
Table 11.N 1757-PLX52 Configuration Options
1757-PLX52 Configuration Options
1757-PLX52 Module Slot Width 2 slots
Base Execution Periods Supported
(different personalities required)
50 ms, 5 ms
(2)
50 ms CEE 5 ms CEE
Controller Redundancy Supported Yes No
Remote I/O Supported Yes No
I/O Module Execution Period 50 ms 5 ms
Configurable Values for CM/SCM Execution Periods 50, 100, 200, 500,
1000, 2000 ms 5, 10, 20, 50, 100,
200 ms
Configurable Values of Peer Update Rates (period).
• Defines the period at which data is updated for all ‘pull/get’
requests for peer data required by all blocks within a CEE.
(1)
100, 200, 500, 1000
ms 10, 20, 50, 100, 200,
500, 1000 ms
(1) Supervisory Ethernet LAN systems only guarantee a Pull/Get Request Rate of 500 msec or greater. Faster Pull/Get rates can be configured,
however, data arrival at the configured rate cannot be guaranteed for rates faster than 500 msec.
(2) Different firmware is required for the 50ms and 5ms CEEs.
Table 11.O 1757-PLX52 Processing Resources
1757-PLX52 Processing Resources
Definitions:
PU = Processing Unit. The PU represents a platform independent amount of processing resources
(time) required to complete a predefined amount of computational (control) work.
Maximum Cycle Loading: Over an cycle (0-39), the “Average CPU Used” (CPUCYCLEAVG) statistic
is not to exceed the stated maximums.
Minimum Reserved CPU to be Maintained During
Runtime (CPUFREEAVG) 20%
1757-PLX52 Configuration PU Maximum Maximum Cycle
Loading
50 ms CEE – Non-Redundant Configuration 3600 PU/sec 60%
50 ms CEE – Redundant Configuration 1600 PU/sec 60%
5 ms CEE – (Non-Redundant only) 2400 PU/sec 40%
Table 11.P 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