FOXBORO I/A Series® Hardware Control Processor 40 cp40

FOXBORO I/A Series® Hardware Control Processor 40 cp40

The Control Processor 40 is a high-end optionally fault-tolerant station in the Control Processor family (CP10, CP30, CP40) that has:
•a larger memory capacity to support a greater number of blocks
•a faster processor for increased block processing
With high performance, the CP40 is both economical and in line with today's advancing technology. Other members of the CP family are easily upgradable to CP40 capabilities.
The Control Processor 40 performs regulatory, logic, timing, and sequential control together with connected:
•Fieldbus Modules (FBMs)
•Fieldbus Cluster I/O Cards (FBCs)
•SPECTRUM Migration Integrator I/O
•SPEC 200 Migration Integrator I/O
•SPEC 200 MICRO Migration Integrator I/O
It also performs data acquisition (via the Fieldbus Modules), alarm detection and notification, and may optionally serve as an interface for one or more Panel Display Stations.
The non-fault-tolerant version of the Control Processor 40 is a single-width processor module. The fault-tolerant version consists of two single-width processor modules.
Enhanced Reliability
The Control Processor 40 offers optional fault- tolerance for enhanced reliability. The fault-tolerant control processor configuration consists of two parallel-operating modules with two separate connections to the Nodebus and to the Fieldbus.
The two control processor modules, married together as a fault-tolerant pair, are designed to provide continued operation of the unit in the event of virtually any hardware failure occurring within one module of the pair. Both modules receive and process information simultaneously, and faults are detected by the modules themselves. One of the significant methods of fault detection is comparison of communication messages at the module external interfaces. Upon detection of a fault, self-diagnostics are run by both modules to determine which module is defective. The non-defective module then assumes control without affecting normal system operations.
To further ensure reliable communications, the fault-tolerant control processor performs error detection and address verification tests in its Nodebus and Fieldbus interfaces.
For enhanced reliability during maintenance operations, the Control Processor 40 is equipped with a recessed reset button, located at the front of the module. This feature provides for manually forcing a module power off and on (reboot) without removing the module from the enclosure.
Diagnostics
The Control Processor 40 uses three types of diagnostic tests to detect and/or isolate faults:
•Power-up self-checks
•Run-time and watchdog timer checks
•Off-line diagnostics
Power-up self-checks are self-initiated when power is applied to the control processor. These checks perform sequential tests on the various control processor functional elements. Red and green indicators at the front of the control processor module reflect the successful (or non-successful) completion of the various phases of the control processor startup sequence.
The run-time and watchdog timer checks provide continuous monitoring of control processor functions during normal system operations. The operator is informed of a malfunction by means of printed or displayed system messages.
Off-line diagnostics are temporarily loaded into the system for the purpose of performing comprehensive tests and checks on various system stations and devices. Using the off-line diagnostics, a suspected fault in the control processor can be isolated and/or confirmed.
Fieldbus Modules
Fieldbus Modules provide connection of digital I/O, analog I/O, and Intelligent Transmitters to control processors. There are two types of Fieldbus Modules: Main and Expansion. Some main modules can be expanded using an expansion module.
A wide range of Fieldbus Modules is available to perform the signal conversion necessary to interface the control processor with field sensors and actuators. For further information on the Fieldbus Modules, refer to the Fieldbus Modules Product Specification Sheet (PSS 21H-3B1 B3).
Fieldbus Flexibility
The Control Processor 40 is used in three different Fieldbus configurations, which provide broad flexibility in Fieldbus implementation:
•Local Fieldbus (Figure 1) - Used only within the enclosure, the local bus can extend up to 10 m (30 ft). Up to 24 Fieldbus Modules (excluding expansion modules) attach directly to the local bus, which is redundant.

•Twinaxial (Dual-Conductor Coaxial) Fieldbus Extension (Figure 2) - Using twinaxial cable, the Fieldbus can optionally extend outside of the enclosure and can be up to 1800 m (6000 ft) in length. Up to 64 Fieldbus Modules (excluding expansion modules) attach to the extended bus through Fieldbus isolators. (Up to 24 Fieldbus Modules, excluding expansion modules, can connect to each isolator.) The twinaxial Fieldbus extension may be redundant.
•Fiber Optic Fieldbus Extension (Figure 3) - The fiber optic Fieldbus can optionally extend the distance as well as add application versatility and security. Overall Fieldbus length can be up to 20 km (12.4 mi). Like the twinaxial Fieldbus configuration, the fiber optic Fieldbus configuration supports up to 64 Fieldbus Modules (excluding expansion modules), up to 24 Modules per isolator.