User`s guide

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Controlinc 1746-C (Version 5.21) Network Master Users Guide (2004-11-18)

Scenario 3: Actuator powered down.

If the actuator is just powered down and nothing else is physically wrong with the

network, the network communication is supposed to pass through to the next unit.

In this case, the 1746-C should be able to communicate with the entire network except

for the system that is powered down.

This means that in table [1], there would be the following values:

• “3” in the locations for actuator that is powered down.

• “0” in the locations for the rest of the actuators.

Bit-14 in table [2] would be set = “1” for the actuator that is powered down. It would be

clear for the rest of them.

Scenario 4: Actuator is having “problems” communicating on a particular channel (particular side …

“A/B” or “Left/Right” or “In/Out” …).

In this scenario, the problems could be reflected in many ways by the 1746-C …

depending upon the type of problem at the actuator. However, the highest probability is

that the problem would be reflected on the appropriate 1746-C port for that actuator and

any actuator that is physically located between the 1746-C and the specific actuator

having problems.

For example, assume port A on actuator [4] was having a problem communicating. In

this case …

Via Port 2, the 1746-C …

• can communicate with actuators 1 – 3 and

• cannot communicate with actuator 4 (by definition)

• actuators 5 – 8: depends upon the hardware problem at the actuator.

Via Port 1, the 1746-C …

• can communicate with actuators 8 – 4 and

• actuators 3 – 1: depends upon the hardware problem at the actuator.

In summary for table [1] possibilities:

• All actuators can communicate over at least one port (so no total COM faults).

(no “3” entries in table [1] )

• There is a possibility that all actuators could communicate on both channels

except #4.

(many “0” entries and possibly one “2” entry in table [1] )

• There is a possibility that none of the actuators could communicate on both

channels.

(many “1” and “2” entries in table [1] )

Since all actuators could communicate, Bit-14 in table [2] would be clear for all actuators.