Honeywell 900R04-0200 4 I/O Slot Rack

Alarms

Up to four electromechanical alarm relays are available to activate external equipment

when preset alarm setpoints are reached. Each of the four alarms can be set to monitor

two independent setpoints. Each alarm setpoint can be either high or low alarm. The

alarm type can be selected to be either of the inputs, the Process Variable, Deviation,

Output, Shed from communications, PV rate of change, or to alarm on manual mode

activation or a Current Output Open failure. It can also be used as an On or Off event at

the beginning or end of a Ramp/Soak segment. An individual alarm hysteresis setting is

provided for each relay and these are configurable from 0 to 100% of range.

 Alarms can be configured as latching or non-latching. continued

 Alarm blocking is also available which allows start-up without alarm energized

C300 Controller Overview 

Honeywell’s C300 Controller provides powerful and robust control for the distributed control system (DCS).  

The C300 is a node in operating Honeywell’s field-proven deterministic Control Execution Environment (CEE) 

core software. The CEE software provides a superior control execution and scheduling environment. Control 

strategies for each controller node are configured and loaded through a common Control Builder, an easy and 

intuitive engineering tool. 

In addition to a standard and robust library of pre-built function blocks and algorithms, the C300 Controller also 

supports Custom Algorithm Blocks (CABs). Custom Algorithm Blocks are similar in purpose and structure to the 

standard function blocks that are distributed with Control Builder. However, CABs have user-defined algorithms 

and data structures, allowing custom tailored strategies to be developed to specific requirements.  

The C300 controller shares its hardware design with the Series 8 I/O, offering an innovative design that reduces 

footprint and installation and maintenance costs. The C300 controller module is mounted on the C300 Input 

Output Termination Assembly (IOTA). The C300 IOTA contains only passive devices such as FTE address 

switches. Figure 1 below depicts the IOTA components. 

Series 8 I/O Overview 

This document provides technical information to configure the Series 8 I/O. 

The following Series 8 I/O items are included in this document. 

• TC/RTD 

• Analog Input – Single Ended 

• Analog Input with HART – Single Ended 

• Analog Input with HART – Differential 

• Analog Output 

• Analog Output with HART 

• Digital Input Sequence of Events (SOE) 

• Digital Input, 24 VDC 

• Digital Input Pulse Accumulation 

• Digital Output, 24 VDC 

• DO Relay Extension Board 

Definitions 

• Input Output Termination Assembly (IOTA): An assembly that holds the IOM and the connections for field wiring; 

• Input Output Module (IOM): A device that contains most of the electronics required to perform a specific I/O function. 

The IOM plugs onto the IOTA. 

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