Ethernet Distributed I/O Topology
A Quantum Hot Standby system can control distributed I/O devices using 140 NOE 771 •1 or 140 NOC 78 •1 Ethernet modules. The following example is a Quantum EIO Hot Standby system, showing 140NOC78000 distributed I/O head modules supporting distributed I/O devices, 140NOC78100 control head modules providing transparency between a and the . Also shown are 140CRA31200 Ethernet remote I/O adapter modules, which manage the drops. BMXCRA312•0 adapter modules can be used to support Modicon X80 Ethernet remote I/O drops. For more information on these adapter modules, refer to the Quantum EIO Remote I/O Modules Installation and Configuration Guide.
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fiber cable used between 2 dual-ring switches (DRSs) to extend the distance beyond 100 m between the Hot Standby controllers (this is optional)
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DRS connecting a distributed I/O cloud to the main ring
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fiber cable used between 2 DRSs to extend the distance between 2 remote I/O drops
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DRS connecting a distributed I/O cloud to the main ring
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primary and standby local racks (containing the controller, the power supply module, a 140CRP31200 remote I/O head module, a 140NOC78000 distributed I/O head module, and a 140NOC78100 control head module)
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remote I/O drops (containing the 140CRA31200 adapter module and I/O modules)
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distributed I/O clouds
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fiber cable used for the CPU-sync link to expand the distance beyond 100 m
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control network (connected to the 140NOC78100 module on the local rack)
NOTE: In the case of switchover in a Hot Standby configuration, 140NOC78•00 module IP addresses change from IP to IP+1.
NOTE: A predefined configuration,
C15, is available for the switches that support a fiber link between the primary and standby controllers.
NOTE: The preceding figure shows the 140NOC78•00 modules, which have 4 Ethernet ports. 140 NOE 771 •1 modules have 2 Ethernet ports.
NOTE:
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For detailed information regarding the 140NOC78000 module, refer to the Quantum EIO Distributed I/O Network Installation and Configuration Guide.
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For detailed information regarding the 140NOC78100 module, refer to the Quantum EIO Control Network Installation and Configuration Guide.
Distributed I/O Drop Hold Up Time
The drop hold up time must be configured for each drop module in the Hot Standby system:
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for an EIP distributed I/O device: it must be greater than the connection time-out + 3.5s
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For Modbus TCP distributed I/O devices, the value must be both:
NOTE: Schneider-Electric devices can have different configurations of drop holdup time and connection timeout, but some third party devices cannot. These third party devices are not fully compatible with a Quantum Hot Standby system.
The service on the 140 NOE 771 •1 / 140NOC78•00 module is always active — it is not linked to the Hot Standby mode.
