GE 90-70 manual Chapter Fault Detection

Contents

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

GFK-1527A Contents vii