Miscellaneous Operation Information, Timed Contacts | GE 90-70

4

Miscellaneous Operation Information

Timer and PID Function Blocks

Timer and PID function blocks remain in lock step between two synchronized units provided:

A.Enabling logic is identical on both units. This includes power flow, frequency of calling sub-block, and so forth.

B.The sub-block in which the function block occurs has the same name in both units. Note that _MAIN is always common.

C.Reference registers (3 for timers, 40 for PID) and reset references for each timer and PID function block are included in the data transfer lists.

For example, if the following ladder logic is identical in sub-blocks on both units, %M100, %R250, %R251, and %R252 must all be transferred on resynchronization to keep both units running timers synchronously:

%M100	TMR
----] / [------------

1.00s

%M100

-------------------( )

%L10 - PV CV - %L20 %R250

Timed Contacts

When both systems are synchronized, timed contacts (%S3, %S4, %S5, %S6) have exactly the same value in both units. For example, whenever T_SEC is on in one unit, it also is on in the other unit as long as both units are synchronized.

Multiple I/O Scan Sets

I/O scan sets are configured by editing the CPU Hardware Configuration using Control software. Refer to the Control online Help system for detailed information on configuration of I/O scan sets. Control programming software Release 2.00 or later is required to configure this feature.

The Redundancy CPU supports the configuration of multiple scan sets. However, it is strongly recommended that the redundant I/O be configured in the default scan set (Scan set 1) which is scanned every sweep. The I/O scan set feature allows the scanning of I/O points to be more closely scheduled with its use in user logic programs.

I/O Scan sets that are not scanned every sweep are not guaranteed to be scanned in the same sweep in the Primary and Secondary CPUs. For example, if the Primary and Secondary CPUs each have

GFK-1527A

Chapter 4 Normal Operation

4-21

Image 60

GE 90-70 manual Miscellaneous Operation Information, Timer and PID Function Blocks, Timed Contacts, Multiple I/O Scan Sets

Contents

GE Fanuc Automation GFL-002 Content of This Manual PrefaceRelated Publications Preface Contents Contents Chapter Fault Detection Appendix a Cabling Information Introduction Definition of Terms Enhanced Hot Standby CPU Redundancy Using the Redundancy CPU for Non-Redundant Operation Compatibility with CPU780 Features not Available with Redundancy CPUs Redundancy CPUs as Compared to Other Series 90-70 CPUsDifferences in Operation for Redundancy CPUs Enhanced Redundancy CPU Module Redundancy Communications ModuleRedundant Racks Systems for Enhanced Hot Standby CPU Redundancy Genius I/O Local I/OCable Connections Enhanced Hot Standby CPU Redundancy System with Local I/O Local I/0 Can be Control Strategies GHS Control StrategyGDB Control Strategy Basic Enhanced Hot Standby Operation Output Control with GHSOutput Control with GDB Basic CPU Redundancy Setups Single Bus with Preferred Master GHS Control Strategy Single Bus with Floating Master GDB Control Strategy Critical Data + Redundant Outputs Transferred Dual Bus with Floating Master GDB Control Strategy Paired GBC = INT/EXT Internal External Online Programming On-Line RepairDuplex CPU Redundancy For Installation Instructions System ComponentsSystem Racks Features Redundancy CPU Watchdog Timer CPU ArchitectureExpansion Memory Board CPU Features Memory Protect KeyswitchBattery Connectors CPU LEDs CPU Mode Switch Port Redundancy Communications Module Unit Select Pushbutton Connector RCM Status Leds Connectors Bus Transmitter ModuleBus Transmitter Module Status LEDs Bus Receiver Module Cables and TerminationBus Receiver Module Status LEDs Genius Bus Controller Location of GBCs and Blocks Single Bus Genius Networks Dual Bus Genius Networks Bus Controller LEDs Configuration Requirements Programmer Connection for ConfigurationOne Application Program in Both PLCs Program Folders in Control Programming Software CPU Configuration Parameters Program Folders in Logicmaster Configuring Shared I/O References Parameter Default Range Description Finding the Memory Available for Application Program Storage System Communications Window Considerations Rack Module Configuration Parameters Bus Controller Configuration Parameters Genius I/O Block Configuration Parameters Normal Operation Powerup of a Redundant CPU Incompatible Configurations Resynchronization of a Redundant CPU GHS Control Strategy GDB Control Strategy References for CPU Redundancy Ovrpre %S Reference Not Available Scan Synchronization Sweep Time Synchronization Output Data Transfer to the Backup Unit AT a Data Transfer Time Fail Wait Time GFK-1527A Normal Operation Programming a Data Transfer from Backup Unit to Active Unit Data Transfer Example Disabling Data Transfer Copy in Backup Unit Svcreq #43 Command Block for Svcreq #43 Backup Qualification with Svcreq #43 Validating the Backup PLCs Input ScanValidating the Backup PLCs Logic Solution Switching Control to the Backup Unit Switching Times RUN Disabled Mode RUN Disabled Mode for GHS Control StrategyExample 1 Role switches allowed on both units Example 2 Role switches allowed on both units Example 3 Role switches not allowed on either unitExample 4 Role switches allowed on both units Backup Active RUN Disabled Mode for GDB Control Strategy Example 8 Invalid Finding the Words to Checksum Each Sweep CGR772 CGR935 Finding the Background Window Time Finding the Total Sweep Time Timer and PID Function Blocks Miscellaneous Operation InformationTimed Contacts Multiple I/O Scan Sets Stop to RUN Mode Transition Sequential Function Chart Programming SFCDebugger Background Window Time Genius Bus Controller Switching Ethernet Global Data in a Redundancy CPU Ethernet Global Data Consumption Ethernet Global Data Production Sntp Timestamping Fault Detection Configuration of Fault Actions Fault Detection PLC Fault Table Messages for Redundancy Message Fault Description Corrective Action With redundancy in other fault groups Fault Response Faulting the Redundancy Communications Module Losing a Link Fault Actions in a CPU Redundancy System Configurable Faults Fault Group Type Description Non-Configurable Fault Group Fatal Faults on Both Units in the Same Sweep On-Line Repair Power Supply Maintaining Parallel Bus TerminationOn-Line Repair Recommendations Racks Central Processor Unit Redundancy Communications Module and CablesRedundancy Communications Link Failures Single Bus Networks Bus faults Bus Transmitter ModuleGenius Bus Controller Genius Bus Dual Bus Networks Genius Blocks Specifications Cabling InformationIC690CBL714A Multi-drop Cable Purpose Connector a Connector A, 15-pin Female Battery connectors Bus Controller, Genius Index Index Online programming Online repair Svcreq