Rockwell Automation 1757-SWKIT4000 ProcessLogix R400.0 Installation and Upgrade Guide - Manual (Page 277)

Publication 1757-IN040B-EN-P - March 2002
Performance and Capacity Specifications 11-25
I/O Module Sample Periods
I/O Network Configuration Rules
Table 11.Q I/O Module Sampling Period Specifications
Input Module types Sampling period
Typical Input Module
Includes 1757/1756, 1797-FLEX Ex and 1794-FLEX I/O input
modules, and CN2FFs with exceptions noted below 25 ms
High Density / Non-Isolated Analog Input Module (1756-IF16) 250 ms
RTD Module (1756-IR6I) 50 ms
Thermocouple Module (1756-IT6I) 50 ms
Serial Interface Module (TC-MUX021) 250 ms
Digital Input Module used by 5 ms (local only) 1 ms
Note: For CMs which contain associated input channels, it is recommended that the CM
execution period should be set to at least double the input module sampling period.
Output Module Type Sampling Period
Typical Output Module
1757/1756 +1797 FLEX EX and 1794-FLEX I/O Output Modules 50 ms
Input/Output Module Type Sampling Period
PFB Module (SST-PFBCLX)
Note: Update rate is configurable on the PBIM block. Default = 25 ms
Minimum =
12.5 ms (local chassis);
5 ms (remote chassis)
Maximum = 50 ms
Table 11.R I/O ControlNet Addressing
MACID Rules and Descriptions
1
(ControlNet
Keeper)
•
Must be configured on every physical I/O ControlNet segment.
•
Must be assigned to the Downlink 1756-CNB in the Controller chassis or to both
Primary and Secondary Downlink CNBs in a Redundant Chassis Pair (RCP) for each
physically separate I/O ControlNet segment.
2 •
Must not be assigned to any Node when using Redundant Controller.
(1)
•
Should be reserved when using non-redundant Controller for future Redundant
upgrade.
3
•
Must not be assigned to a Downlink 1756-CNB in a Controller chassis or
Redundant Chassis Pair.
•
Must be assigned to a Remote 1757/1756 I/O chassis 1756-CNB(R)\C or
1756-CNB(R)\D or Remote 1794/1797-ACN(R)15 or CN2FF, in conjunction with
each MACID #1 assignment.