Schneider Electric 840 USE 106 0 manual Guidelines for Planning a Hot Standby System, Primary

Planning a Quantum Hot Standby System

Guidelines for Planning a Hot Standby System

Primary and	Both the primary and the standby controller in your Hot Standby system must be
Standby	ready to perform as a stand-alone controller in the event that its counterpart fails.
Controllers	Therefore, you should install them with equal care, according to Modicon’s standard
	planning and installation guidelines. Refer to the Quantum Automation Series
	Hardware Reference Guide, 840 USE 100 00, and the Remote I/O Cable System
	Planning and Installation Guide, 890 USE 101 00, for details.
	Design your system for safety first, then for economy. Be sure that you understand
	all the cautions and warnings in this manual before you begin to install your system.
	For the Hot Standby system to function, your component modules must meet the
	version requirements in Overview of Quantum Hot Standby, p. 13.
	You must use identical modules in the primary and standby racks. If you have
	different models or different versions of the same model or different flash executive
	software, the Hot Standby system will not function properly.
	Note: The order of the modules in the backplanes must be the same.
	While the controllers and RIO heads must be Quantum models, the remote drops
	may use Quantum, 800 series, 500 series or 200 series I/O with corresponding drop
	processors.
Positioning
	The CHS 110 Hot Standby modules are connected by fiber optic cable. A 3 meter
	cable is supplied with the kit. However, the primary and standby backplanes may be
	placed as much as 1 km apart. If you will be placing the modules more than 3 m
	apart, use 62.5/125 micrometer cable with ST-style connectors. Refer to Fiber Optic
	Cable Guide, p. 213 for details.
	If you intend to place the units more than 3 meters apart, you must consider the
	effect on the RIO network and any Modbus Plus network.
	The controllers are linked to the RIO network by coaxial cable. The longer the
	distance between the controllers, the higher the grade of trunk cable required to
	maintain signal integrity. Refer to Chapter 3 of the Remote I/O Cable System
	Planning and Installation Guide, 890 USE 101 00, for details regarding cable grades,
	distances and signal integrity. If no coaxial cable will be sufficient to maintain signal
	integrity throughout the RIO network, fiber optic repeaters may be used to boost the
	signal. Refer to the Modbus Plus Network Planning and Installation Guide, 890 USE
	100 00, for details on extending a Modbus Plus network.

56 840 USE 106 00 January 2003