Triconex MP3101 Main Processors

Main Processors

The Main Processors execute the system diagnostics and the user-written

control program.

Three MPs must be installed in the Main Chassis of every Tricon system. Each MP independently communicates with its I/O subsystem and executes the user-written control program.

Every Trident system contains three Main Processors. Each MP controls a separate channel and operates in parallel with the other two MPs.

A dedicated I/O control processor on each MP manages the data exchanged between the MP and the I/O modules. A triplicated I/O bus, located on the baseplates, extends from one column of I/O modules to the next column using I/O bus cables.

The I/O control processor polls the input modules and transmits the new input data to the MPs. The MPs then assemble the input data into tables that are stored in memory for use in the voting process. The input table in each MP is transferred to its neighboring MP by the Tribus. After this transfer, voting takes place. The Tribususes a programmable device with direct memory access to synchronize, transmit, and compare data among the three Main Processors.

If a disagreement occurs, the signal value found in two out of three tables prevails, and the MPs correct the third table accordingly. One-time differences that result from sample timing variations are distinguished from a pattern of differing data. The MPs maintain data about necessary corrections in local memory. Built-in fault analyzer routines flag any disparity and use it at the end of each scan to determine whether a fault exists on a particular module.

The Main Processors send the corrected data to the application. The 32-bit MP executes the application in parallel with the neighboring MP and generates a table of output values that are based on the table of input values according to user-defined rules. The I/O control processor on each MP manages the

transmission of output data to the output modules by means of the I/O bus. Using the table of output values, the I/O control processor generates a smaller table for each output module and transmits these tables to the appropriate channels of the output modules over the I/O bus. For example, the Main Processor A transmits a table to Channel A of each output module over I/O Bus A. The transmittal of output data has priority over the routine scanning of all I/O modules.

Each MP provides

One Ethernet (IEEE 802.3) TriStation port for downloading the application

to the Trident controller and uploading diagnostic information. This port can also be used to download Trident firmware to the Flash ROM.

One Modbus RS-232 or RS-485 serial port which acts as a slave while an external device is a master. Typically, a distributed control system (DCS) monitors-and optionally updates-the Trident controller data directly through an MP.

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