supporting Sequence of Events

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Table Of Contents

Publication 1732E-UM002A-EN-P - March 2010

66 Using the Module

• O.NewDataAck.2 = 1

If Timestamp Latch is disabled, the module sends new data, from

subsequent transitions, to the controller as soon as they occur. The controller

overwrites timestamp data from the last transition, regardless of whether it

saved the data or not.

If the controller does not acknowledge the timestamp data then the NewData

bits in the input tags remains set and the EventOverflow bit is set as well.

Sort the Data

If you need to determine the order of events that occurred in a cascade, you

must use a Sort routine to determine the order of events. Rockwell

Automation offers a sample sort routine that you can use to determine the

order of events in an event cascade.

Visit the Rockwell Automation Sample Code Library at

http://samplecode.rockwellautomation.com/idc/groups/public/documents/

webassets/sc_home_page.hcst.

5. Controller clears data from input 2 on the module.

O.EventAck = 1

O.NewDataAck.2 = 1

Controller tags

Separate array

4. Controller

copies

relevant

data from

controller

tags to a

separate

array.

1. Input 2 transitions

from OFF to ON.

2. Module timestamps

the transition.

3. Module sends input

data to the controller.

1732E-IB16M12SOEDR ControlLogix controller

I.Fault

I.EventOverlow

I.OffsetTimeStamp

I.EventNumber

I.Timestamp[16].OffOn[2]

I.Timestamp[16].OnOff[2]

I.Data

I.NewData

I.ShortCircuit

I.OpenWire

I.GrandMasterClockID

I.LocalClockOffset