Selecting the Correct Topology

Original instructions

Overview

The Quantum EIO system is designed and tested to be . are not resolved deterministically. They are allowed to participate on the , without affecting the deterministic performance of the remote I/O devices.

In order to achieve this determinism, the remote I/O network follows a set of simple rules that are explained in this chapter.

The remote I/O network contains 1 (or 2 in a Hot Standby system) 140CRP31200 remote I/O head module (on the local rack) and one •••CRA312•0 adapter module (on each remote I/O drop). Optional elements include a maximum of 6 communication modules. You can use a maximum of five 140 NOC 780 00 distributed I/O head modules (to manage distributed I/O devices) and one 140 NOC 781 00 control head module (to manage a control network). Instead of 140 NOC 780 00 modules, you can also use 140 NO• 771 •• or 140 NOM 2•• 00 communication modules to support Ethernet distributed I/O or Modbus Plus networks. DRSs can also be used, among other things, to attach sub-rings to the main ring.
DRSs are optimized with predefined configurations that support 50 ms ring recovery time.
Follow the rules regarding the maximum number of devices allowed (e.g., 32 devices, in the main ring, including the local rack, and 31 remote I/O drops in the remote I/O network), the types of cables you select, and respect Control Expert messages during programming and diagnostic checks.

Each Quantum controller supports only 1 Ethernet remote I/O network, which includes a standalone or Quantum controller. This section helps you select the Ethernet remote I/O network that allows optimum response time for remote equipment operations.

In addition, preferred topologies are discussed in detail so that you can construct a that works harmoniously with the remote I/O network's deterministic operation.

NOTE: The architectures described in this document have been tested and validated in various scenarios. If you intend to use architectures different than the ones described in this document, test and validate them thoroughly before implementing.

If you require a topology not discussed on the following pages, for example, if you wish to share a with multiple PLCs, please contact your local Schneider Electric office, which will work with the PlantStruxure competency center to determine your network bandwidth and provide calculations for optimal performance.

What Is in This Chapter?

This chapter contains the following topics:

For a defined application and architecture, the ability to predict that the delay between an event (change of an input value) and the corresponding change of an output state is a finite time t, smaller than the time required for your process to run correctly.

Any Ethernet device (Schneider Electric device, PC, servers, or third-party devices) that supports I/O exchange with a PLC or other Ethernet communication service.

An Ethernet-based network that contains 1 standalone PLC or one Hot Standby system and remote I/O devices. There are 3 types of remote I/O devices: a local rack, a remote I/O drop, and a ConneXium extended dual-ring switch (DRS). Distributed I/O devices may also participate in a remote I/O network via connection to DRSs.

A Quantum rack containing the controller, a power supply, and an Ethernet remote I/O head module. A local rack consists of 1 or 2 racks, the main rack (containing the remote I/O head module) and an optional extended rack. A Quantum Ethernet remote I/O network requires 1 local rack on the main ring.

One of the 3 types of remote I/O devices in an Ethernet remote I/O network. A remote I/O drop is a Quantum or an X80 rack of I/O modules that are connected to an Ethernet remote I/O network and managed by an Ethernet remote adapter module. A drop can be a single rack or a rack with an extension rack.

(dual-ring switch) A ConneXium extended managed switch with one of several possible predefined configurations downloaded to it so that it can participate in an Ethernet I/O network. A DRS provides 2 RSTP-enabled ring connections, one for the main ring and one for a sub-ring. It also manages QoS, which provides a predictable level of performance for both remote I/O and distributed I/O traffic on the same I/O network.

DRSs require a firmware version 6.0 or later.

A high-availability control system with a second (standby) PLC that maintains up-to-date system status. If the primary PLC becomes inoperable, the standby PLC takes control of the system.

A network containing distributed I/O devices that integrates a unique standalone PLC or a unique Hot Standby system. I/O scanning may be performed by a communication module interlinked with a remote I/O head module on the local rack of an Ethernet remote I/O system. Distributed I/O network traffic is delivered after remote I/O traffic, which takes priority in an Ethernet remote I/O network.

An Ethernet-based network within a remote I/O network that contains both remote I/O and distributed I/O devices. Devices connected on this network follow specific rules to allow remote I/O determinism.

The main ring of an Ethernet remote I/O network. The ring contains remote I/O devices and a local rack (containing a controller, a power supply module, and an Ethernet remote I/O head module).