Schneider Electric 840 USE 106 0 IEC Logic in a, Standby controller executes the logic of segment

Using a Quantum IEC Hot Standby System

Controlling the Hot Standby System by Configuration Extension

Configuration Use the Hot Standby Concept configuration extension screen as follows:

Extension

lSpecify the parameters in the Hot Standby command register Define a nontransfer area to help reduce scan time

The parameters in the configuration screens are applied by the controllers at startup. You can change the settings/behavior of the IEC Hot Standby system after already having downloaded the configuration to the controller. Do this either by setting or resetting the particular bits of the Hot Standby command register or by using the Hot Standby specific EFBs of the "System" library.

	Note: If the Hot Standby system is later stopped and then restarted, the
	parameters specified in the configuration extension screens go back into effect.
IEC Logic in a
	In the Concept 2.1/2.2 Hot Standby system, there is no logic executed in the
Hot Standby	Standby controller. This is different from the 984 Hot Standby system, where the
System	Standby controller executes the logic of segment 1.
	In the Concept 2.5 Hot Standby system, the Standby controller executes section 1
	logic; this is similar to the way segment 1 is handled in a 984 Hot Standby System.
	Section 1 may contain logic for diagnostic and optional Hot Standby functions, such
	as battery coil status. Do not program I/O control logic in section 1.

114 840 USE 106 00 January 2003