Rockwell Automation 1757-SWKIT4000 ProcessLogix R400.0 Installation and Upgrade Guide - Manual (Page 278)

Publication 1757-IN040B-EN-P - March 2002
11-26 Performance and Capacity Specifications
1757-PLX52 Resources
4 Should be used by or reserved for additional Remote 1757/1756 I/O chassis
1756-CNB or 1794/1797-ACNR15 or CN2FF.
5 and up Should be used consecutively from low to high values with the following guidelines:
•
Odd addresses should be used for additional Downlink CNBs in Controller chassis
or RCP (with next even address not used), when additional Downlink CNBs are
connected to a common physical I/O ControlNet segment (not allowed with
CN2FFs connected).
•
After Downlink CNBs are assigned, remaining addresses may be used for
additional Remote 1757/1756 I/O chassis CNBs or 1794/1797-ACNR15s or
CN2FFs.
Additional I/O ControlNet Rules
1. Multiple I/O ControlNet Downlink CNBs may be connected to a common physical I/O ControlNet
segment and must adhere to the rules above. Exception for this rule when using CN2FFs, which
must use separate physical segments.
2. PLCs or other ControlNet Devices may not reside on any I/O ControlNet segment connected to a
1757-PLX52 Controller.
3. The ControlNet Keeper is the lowest configured MAC ID per physical ControlNet segment. This
table assumes that MAC ID #1 exists per ControlNet segment. The ControlNet Keeper
periodically broadcasts keeper information using scheduled ControlNet bandwidth. Since the
default maximum number of scheduled nodes (SMAX) is set to 1, every ControlNet segment
should intentionally have a keeper at Mac ID #1.
(1)
4. When the CN2FF is being used, the ControlNet Parameters for that segment must be configured
for NUT = 6.25 ms. and SMAX = to the Highest MACID used (but < = UMAX), using Network
Tools.
5.The maximum number of nodes (UMAX) permitted on the Supervisory Net is 24.
6.The maximum number of nodes (UMAX) permitted on the I/O Net is 20.
(1) The secondary CNB is physically set to MAC ID 1 but logically becomes MAC ID 2 while in the secondary redundancy role.
Table 11.R I/O ControlNet Addressing
MACID Rules and Descriptions
Table 11.S 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
(1)
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.
100
(2)
, 200
(2)
, 500,
1000 ms
10
(2)
, 20
(2)
, 50
(2)
,
100
(2)
, 200
(2)
, 500,
1000 ms