Rockwell Automation Publication 5069-UM004A-EN-P - April 2019 99
Input Module Features Chapter 3
When subsequent short duration pulses are detected at the same input point,
the Latching configuration dictates what changes, if any, occur in the Logix
Designer project.
To acknowledge the last captured pulse, set the output tag of the last input
pulse as follows:
• Off to On transition - Set the O.Ptxx.TimestampOffOnNumberAck tag
= I.Ptxx.TimestampOffOnNumber tag.
• On to Off transition - Set the O.Ptxx.TimestampOnOffNumberAck
tag = I.Ptxx.TimestampOnOffNumber tag.
Once a pulse latch is acknowledged for an input point, the next pulse at that
point increments the corresponding I.Ptxx.TimestampOffOnNumber and
records the timestamp in I.Ptxx.TimestampOffOn.
You can change tag values in program logic while normal module operation
continues or through the Logix Designer application tag editor. For more
information about module tags, see Appendix B,
Module Tag Definitions on
page 231.
Latching Configuration Input Transition Type
Where Pulse Is Captured
Change in Logix Designer Project
Disabled (default)
The following conditions disable Timestamp Latching:
• Enable Timestamp Latching field on the Module
Properties dialog box is clear
• C.Ptxx.TimestampLatchEn tag = 0.
Off to On The I.Ptxx.TimestampOffOnNumber tag increments.
The new timestamp is recorded in the I.Ptxx.TimestampOffOn tag, overwriting the
previous timestamp.
On to Off The I.Ptxx.TimestampOnOffNumber tag increments.
The new timestamp is recorded in the I.Ptxx.TimestampOnOff tag, overwriting the
previous timestamp.
Enabled
The following conditions enable Timestamp Latching:
• Enable Timestamp Latching field on the Module
Properties dialog box is checked.
• C.Ptxx.TimestampLatchEn tag = 1.
Off to On The I.Ptxx.TimestampOffOnNumber and I.Ptxx.TimestampOffOn tags remain
latched until the last captured pulse is acknowledged.
In other words, the tag values remain the same until the last captured pulse is
acknowledged.
On to Off The I.Ptxx.TimestampOnOffNumber and I.Ptxx.TimestampOnOff tags remain
latched until the last captured pulse is acknowledged.
In other words, the tag values remain the same until the last captured pulse is
acknowledged.
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