Controller logs, Controller user logic, Communication network fault operation – Det-Tronics EQP Fire and Gas Detection/Releasing System User Manual

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14.1

95-8533

2-4

note

All fault and alarm conditions are latched on the
Controller. to reset the Controller, conditions
indicated on the text display must currently be in
the oFF state. Pushing the reset button then
initiates a Controller reset. Active alarms will
remain through a Controller reset.

ContRoLLER LoGs
The controller has an internal alarm and event log.

The logs can be accessed via the S

software

configuration ports (Configuration Port or Port 3) using

a RS-232 serial cable and a Windows

™

computer.

The controller can save up to 4,095 alarms and events

in the controller memory.

ContRoLLER usER LoGiC
The Controller continuously executes the user logic

programs that are programmed using S

software.

The user logic programs are set up in the same

fashion as IEC 61131-3 programmable logic

programmed into Programmable Logic Controllers

(PLCs). Block diagram logic gates are tied together

with inputs, outputs, and other logic gates to perform

a specific task. A number of tasks can be tied

together to perform a system function.

Typical programmed functions include flame/gas

voting, timing delays, timing executions, latching

conditions, alarm and trouble notification, suppression

control, condition control, and process shutdown

notification.

The Controller executes program logic by starting with

the first logic page of the first program and then

progressing onto subsequent pages of the same

program. In turn, subsequent programs are then

executed.

Every one hundred milliseconds, the Controller will

start executing the user logic that is programmed into

the Controller. Within this logic execution cycle, the

Controller will execute as many of the logic pages as

possible. If all programmed logic is executed in a

cycle, the Controller will start executing program logic

with the next cycle. Otherwise, subsequence logic

execution cycles are used to finish executing the

remaining logic gates. Only when all the logic gates

have been executed will the Controller start over. The

Controller will start executing the first logic page of

the first program at the beginning of the next logic

cycle.

CommuniCation nEtWoRK FauLt opERation
During normal operation, the Controller is continuously

broadcasting a heartbeat around the communication

loop as shown in Figure 2-2. The Controller

broadcasts the heartbeat in both directions. At the

same time, the field devices are transmitting status

information to the Controller over the communication

loop.

Every field device except the network extender has

two LON fault isolation relays. Each relay is tied to a

communication port on the device. When a field

device fails to receive the heartbeat from the

Controller, the device initiates a LON fault isolation

routine. The isolation routine disconnects one of the

communication ports via one of the LON fault isolation

relays. The device listens for a heartbeat on the

communication port that is connected. If a heartbeat

is not found, the routine then disconnects the other

communication port and listens for a heartbeat on the

connected side. The process is repeated until either

a heartbeat is located or a LON fault timeout period of

two hours is reached. The LON fault isolation routine

is disabled and the LON fault isolation relays are

closed when the LON fault timeout period has

elapsed. The LON fault isolation routine will be

enabled when the device again receives a heartbeat.

For a single wiring fault, the field devices with the fault

will isolate the fault by opening LON fault isolation

relays. After the field devices isolate the wiring fault,

communications will be resumed between the

Controller and field devices. Refer to Figure 2-3.

Figure 2-2—Normal Communication over the LON

Figure 2-3—Communication over the LON with a Single Wiring Fault

D1851

NODE 1

NODE 8

NODE 3

NODE 6

NODE 2

NODE 7

NODE 4

NODE 5

EQP

CONTROLLER

EAGLE QUANTUM PREMIER
Safety System Controller

Fire Alarm

Inhibit

Power

Supr

High Gas

Trouble

Cntrl Flt

Lon Fault

Low Gas

Ack

Silence

Out Inhibit

Eagle Quantum Premier

Time & Date

Cancel

Enter

Next

Previous

Reset

Acknowledge Silence

DET

TRONICS

D1852