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GFK-1527A Contents vii
Fail Wait Time......................................................................................................4-8
Programming a Data Transfer from Backup Unit to Active Unit..................................4-10
Data Transfer Example.................................................................................4-10
Disabling Data Transfer Copy in Backup Unit (SVCREQ #43)...................................4-11
Command Block for SVCREQ #43..................................................................... 4-12
Backup Qualification with SVCREQ #43............................................................4-13
Validating the Backup PLC's Input Scan .............................................................4-13
Validating the Backup PLC's Logic Solution....................................................... 4-13
Switching Control to the Backup Unit.........................................................................4-14
Switching Times................................................................................................. 4-14
Commanding a Role Switch from the Application Program (SVCREQ #26) ........4-14
Example.......................................................................................................4-14
RUN Disabled Mode ..................................................................................................4-15
RUN Disabled Mode for GHS Control Strategy.................................................... 4-15
Example 1: Role switches allowed on both units..................................................4-15
Example 2: Role switches allowed on both units..................................................4-16
Example 3: Role switches not allowed on either unit............................................4-16
Example 4: Role switches allowed on both units..................................................4-16
Example 5: Role switches allowed on both units Secondary Unit Active..............4-17
Example 6: Role switches not allowed on either unit, Secondary Unit Active.......4-17
Example 7: Role switches allowed on both units, Secondary Unit Active............. 4-17
Example 8: Invalid..............................................................................................4-18
RUN Disabled Mode for GDB Control Strategy ...................................................4-18
Background User Checksum and Background Window Timing Instructions................4-19
Finding the Words to Checksum Each Sweep...................................................... 4-19
Finding the Background Window Time...............................................................4-20
Finding the Total Sweep Time.............................................................................4-20
Miscellaneous Operation Information .........................................................................4-21
Timer and PID Function Blocks .......................................................................... 4-21
Timed Contacts...................................................................................................4-21
Multiple I/O Scan Sets........................................................................................4-21
C Debugger ........................................................................................................4-22
STOP to RUN Mode Transition ..........................................................................4-22
Background Window Time .................................................................................4-22
Sequential Function Chart Programming (SFC)...................................................4-22
Genius Bus Controller Switching................................................................................4-23
Ethernet Global Data in a Redundancy CPU ............................................................... 4-24
Ethernet Global Data Consumption ..................................................................... 4-24
Ethernet Global Data Production.........................................................................4-25
SNTP Timestamping...........................................................................................4-25
Chapter 5 Fault Detection ................................................................................................ 5-1
Configuration of Fault Actions......................................................................................5-1
Fault Detection.............................................................................................................5-2
PLC Fault Table Messages for Redundancy..................................................................5-3
Fault Response .............................................................................................................5-5
Faulting RCMs, Losing Links, and Terminating Communications.................................5-6
Faulting the Redundancy Communications Module...............................................5-6
Losing a Link........................................................................................................5-6