Emerson Model M250N Controlinc Network Controller System Configuration

System Configuration

Controlinc Network Master Model M250N contains redundant valve actuator network masters

in a single enclosure. M250N supports one Controlinc E>Net ring network with up to 250 valve

actuators. Options for support of redundant bus networks and redundant E>Net rings are also

available. The supplied system uses standard RS485 and Modbus RTU protocol for the valve

actuator networks. Ethernet TCP/IP encapsulated Modbus protocol connections are provided

for redundant host computer networks. The Ethernet links are IEEE 802.3 with RJ45 connectors

for 10/100Base-TX. Protocol is Ethernet v2 encapsulation TCP/IP Version 4.

Redundant systems consist of two identical chassis with identical software. One is the

primary master and the other a hot stand-by master. The two chassis may switch roles of

primary and hot stand-by at any time. Figure 1 shows the specific system configuration of

the supplied system. The network masters communicate with Controlinc valve actuators

that control both block valves (Open, Stop, Close) and modulating or positioner type valves.

The system consists of two six-slot chassis with each chassis having a central processor

located in Slot 0. which provides a global database for the CoProcessors installed the chassis.

The central processor also performs such functions as watchdog timers and system alarm

generation for the CoProcessors. It also provides interrupt control for fast data transfers

between processor modules. The main processor in each chassis supports a “Data Exchange

Link” (DxL) to share all data between redundant databases. See Figures 2 and 3 for internal

communication link connections.