State Industries GFK-0827 manual Genius Bus Controller User Features

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The Hot Standby CPU Redundancy system uses a single Genius bus and requires one GBC module in the Primary PLC and one in the Secondary PLC; however there can be multiple Genius busses configured in this manner in a system. The GBCs in the Primary PLC are assigned SBA 31, and the GBCs in the Secondary PLC are assigned SBA 30. Data from SBA 31 in the Primary PLC is the ºpreferredº data. The Primary PLC is normally the active unit in the redundancy system.

In a redundancy system the GBCs must be configured for ºRED CTRLº redundancy. All of the Genius devices on the Genius bus must also be configured for ºRedundancyº

The bus can have up to 30 Genius devices connected to it, with one of the SBAs reserved for the Hand-Held Monitor. Any type of Genius I/O block may be connected to this bus. A Genius I/O device will use the output data received from SBA 31 in preference to data from SBA 30. If the active and backup units switch roles, the GBC will then use the output data from SBA 30.

As a safety feature, a watchdog timer protects each Genius I/O link. This timer is periodically reset by the GBC software, Should it ever expire, the microcontroller on the board ceases functioning and the Channel OK LED turns off. If this happens in a CPU Redundancy system, the other GBC will then drive the Genius I/O blocks The cause of the link failure must be determined to re-establish communications.

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Genius Bus Controller User Features

	A Genius Bus Controller can be installed in any slot in rack 0, except
	for slot 1 which is reserved for the CPU module. It can be installed
					MODEL 70
	in any slot in an expansion rack, except slot 1 which must contain a					BEM 731
						MODULE OK
	Bus Receiver Module.					CHANNEL 1 OK
						NOT USED
					ON = OK
						HAND HELD
						MONITOR
	LED Status Indicators					CHANNEL 1
					MODULE FUNCTION
	The GBC has three LEDs located at the top of the board: one as an
					GENIUS BUS
					SERIES 90±70
	indicator of the state of the board, and one to indicate the state of				CONTROLLER
					( 1 CHANNEL )
	the Genius I/O link. When the board is functionally properly, the
					Removal of terminal
	top two LEDs are ON (third LED currently not used). They are				block breaks bus if
					external jumpers are
	either blinking or OFF to indicate special or failure conditions. If,		not applied as shown
						CHANNEL 1
	after the power-up diagnostics routine has been completed, all LEDs		SER 1						SER 1
	are OFF, this is an indication that a board failure has been detected		SER 2						SER 2
	and the board must be replaced.
			SHIELD						SHIELD
				OUT					IN
	Module OK				N				N
					C				C
					N				N
	The top LED, labeled OK, indicates the health of the GBC. It is ON				C				C
					C				C
					N				N
	when the board has successfully completed the power-up
					MODULE
	diagnostics. If the power-up diagnostics detects a failure or if the
						IC697BEM731C
	board fails during operation, the LED will be OFF. The LED blinks				LABEL
							44A726758±11
	during the power-up diagnostics and when the GBC is installed in
	a slot different from the slot specified by the configuration
	information downloaded from the programmer.
		GENIUS BUS CONTROLLER
GFK-0827	Chapter 2 System Components							25